Sunday, April 7, 2024

Rome Wasn’t Built in One Day: Shonan Village for Mt. Ogusu Hiking Course 大楠山

 


There are several forests in Kanagawa Prefecture where it is famous for their cherry blossoms. In previous few years, I told you my adventure with cherries in forests of western Tanzawa 丹沢, near Yadoriki Water Source Forest やどりき水源林. This year, I change my destination to the south, that is Miura Peninsula 三浦半島. Compared with Tanzawa, or even Yokohama, the area is warmer with sea breeze from Tokyo and Sagai Bays all year round. Inevitably, cherry trees there are for such climate. Planted Cerasus lannesiana ʽKawazu-zakura’ and Somei-Yoshino trees aside, the majority of cherry trees in natural forest there are Prunus speciosa and Cerasus jamasakura. Actually, it is said that Prunu speciosa there were also transplants by humans from Izu Peninsula 伊豆半島 and Ohshima Island 大島 which is visible on fine days from Miura Peninsula. Miura Peninsula appears in ancient documents from around the 12th century as a party place of cherry blossoms for Japanese politicians. Geologically, the peninsula ends with Kamakura 鎌倉 where the first samurai Shogun, Kamakura Shogunate 鎌倉幕府, yielded power for national politics during 12th – 14th centuries. I guess since that time people planted a lot of seedlings from Ohshima Island in their forests. 700 years later, their offsprings adorned the peninsula. Not bad, don’t you think? (More to this in my later post of this series.)

Buds almost reaching to opening …

Our itinerary is to Mt. Ogusu 大楠山, the highest peak of the Peninsula at ASL 241.1m. The peak has several approaches. Today, I will tell you the easiest way to the top. And the descending routes to the eastern shore of Sagami Bay have a VERY high concentration of cherry trees, many probably planted hundreds of years ago. If you plan to have leisurely hike for admiring cherry blossoms, they are the best choices. Oh, I have to tell you this. The majority of cherry blossoms on the slopes of Mt. Ogusu are not Somei-Yoshino, but wilder variety. Somei-Yoshino was created during the early 19th century in Edo (aka Tokyo) whose parents are Prunus speciosa (dad) and Cerasus itosakura var. itosakura f. ascendens (mom). There would be natural hybridizations in the area, but it would be more relaxing thinking the cherry trees there are mainly Prunus speciosa and Cerasus jamasakura. How to distinguish them? Well, Somei-Yoshino and Mom tree open their flowers before leaves come out. Whereas Dad tree and Jamazakura open flowers and leaves from the buds at once. Many cherry trees above our head in Mt. Ogusu have both leaves and flowers when it’s in flowering season. You see?

Cherry blossoms with young leaves together in Mt. Ogusu.
Could you figure it out the petals are white
and young leaves have pointed tips?
These are the sign the tree is
Prunus speciosa.

The starting point of today’s hike is the bus stop Shonan Kokusai-mura Center Mae (the Front for Shonan Village Centre 湘南国際村センター前). The public transportation to the Center is from JR Zushi Station 逗子駅 or Keikyu Zushi-Hayama Station 逗子葉山駅 by Keikyu Bus Zu-16 逗-16 service; the bus starts from JR Zushi, then stops at Keikyu Zushi-Hayama (; the time table is from here for JR, and here for Keikyu). Oh, I have to add this. It’s better to go to toilet at the stations. The reason follows below. Please keep on reading. It’s about 25 minutes’ bus ride, and please get off the bus at the terminal stop, Shonan Kokusai-mura Center Mae. You’ll find yourself in the middle of some campus. No wonder. Once upon a time, Mitsui Fudosan, a developer, bought the land here planning to build a golf course. In the middle of the development, around 1983, they figured out it was a bad plan for their bottom line, and sold the entire area to the Prefectural Office. Kanagawa Prefecture re-planned the idea, and re-sold sections to Mitsui Fudosan for housing development and to several corporations, including National University Corporation. Now the area has houses, research and training centers for large companies in Tokyo, the National Graduate University for Advanced Studies, Institute for Global Environmental Strategies (IGES), etc. No shopping center. To enter the premises there for, say, toilet, you have to carry your IC-tipped ID. So, my advice for toilet.

JR Zushi Station

Please take Zu-16 service from
Bus Stop #1 in front of Zushi Station.

The bus stop Shonan Kokusai-mura Center Mae
(the Front for Shonan Village Centre
湘南国際村センター前).

Near the terminal stop there is this map for Shonan Village.

The hike for Mt. Ogusu starts like this. Adelante, por favor.

The entrance to IGES we pass by.

Anyway, you arrive at the terminal stop and start walking to the direction of the east. Don’t worry. The road is impeccably wide and paved and the sidewalk is beautiful. Most of all, it’s one way. We slowly go up. In less than 10 minutes, we reach a large roundabout. Over there on our right is an ample parking space. We take a wide paved road sans sidewalk to the left. It slowly goes down and winding. Soon you’ll notice the both sides of the road are something of under-nurturing, with notices like “Planted area” or “Keep-out; Under vegetation-restoration.” The area is called Megurino Forest for Shonan Village 湘南国際村めぐりの森. When the Prefecture re-planned the development with Mitsui Fudosan, the developer donated the area to the Prefecture and the Office decided to make the place for nature conservatory. I surmise when they completed the negotiation, this portion of the land was a half-completed golf course, the original vegetation was stripped off. Many spaces are now hayfield with sedges as pioneer plant. Several places are cleared and reforested with seedlings of broad-leaved trees found commonly, say, on the slopes of Mt. Ogusu. Probably, for the area to be like Mt. Ogusu, it would take 700 years or so. But, anyway, it’s a start. Better than nothing, right?

The roundabout and the parking space over there.

We go this way.
There is a signpost showing the direction to Mt. Ogusu.

It’s a good road, for sure.

Both sides are mainly like this.

But occasionally such notices are standing.
It says beyond the point of notice board is
 for permit holders only
as the area is for vegetation restoration.

The trees at this point were planted in 2019.

Beyond the bush,
we can see the beach and Pacific Ocean over there.

The good thing about this route is, it’s a care-free stroll on the perfectly paved road with very little car traffic. The road ends at the beginning of the hiking road to Mt. Ogusu, and before reaching to that point, there is nothing, really nothing, except nurtured vegetations on both sides. + No parking space at the end. No casual driver has incentive to drive here. So, as hikers, we relax and proceed on a one-way road. Eventually, we can start recognizing a strange looking white tower in our direction. It’s a very important meteorological facility for us living in megalopolis Tokyo. I’ll tell you more about this next week. To the left of the tower, we can recognize a slightly higher ridge of the mountain. It’s the peak of Mt. Ogusu, the place we go today. Our way is still smoothly paved and winding. Soon, there is a clubhouse for a golf course, Hayama International Country Club 葉山国際カンツリー俱楽部, beyond the fence on our left, and soon, we can find the end of the road over there. From the bus stop to the end of the road it is less than 30 minutes. We can finally start hiking!

There are directions to Mt. Ogusu along the way.

Could you see white something on the ridge over there?
 We’ll go there soon.

The clubhouse over there.

We are reaching the end of the paved road.

Let’s hike!

If you find environmental issues in Kanagawa Prefecture, please make a contact with Kanagawa Natural Environment Conservation Center 神奈川県自然環境保全センター

657 Nanasawa, Atsugi City, 243-0121
〒243-0121 厚木市七沢657
Phone: 046-248-0323

You can send an enquiry to them by clicking the bottom line of their homepage at http://www.pref.kanagawa.jp/div/1644/

Sunday, March 31, 2024

Open! Cherry blossoms finally opened in Yokohama

 


So, we were anxious about the cherry blossoms this year. This weekend, THEY FINALLY OPENED THIS SPRING! Not only that, they are accelerating the speed of reaching full bloom, by hours.

Morning, Cerasus jamasakura in Yokohama
The same tree in the afternoon
It’s another type of cherry tree, garden species.

Somei Yoshino in Ikebuchi Open Space of Niiharu.
 Almost reaching to the full bloom ...

So, Naomi become suddenly uber-busy to visit the places with cherry blossoms. This is super short post for this week. I‘ll tell you my adventure with cherry blossoms next week. Sorry.

Cerasus incisa, an endemic species found around Mt. Fuji.


If you find environmental issues in Kanagawa Prefecture, please make a contact with Kanagawa Natural Environment Conservation Center 神奈川県自然環境保全センター

657 Nanasawa, Atsugi City, 243-0121
〒243-0121 厚木市七沢657
Phone: 046-248-0323

You can send an enquiry to them by clicking the bottom line of their homepage at http://www.pref.kanagawa.jp/div/1644/

Sunday, March 24, 2024

Please don’t tease me … Cherry blossoms this year in Kanagawa Prefecture

 


Two months ago in January, weather forecasters told us that it was a warm winter, and thus cheery blossoms would come early, maybe around 20th of March as in 2023. Now, it is March 24th, and the “official” opening doesn’t come to Kanagawa Prefecture. “Official opening” = The first day when a specimen tree has more than 5 opened flowers. Specimen tree for Kanagawa Prefecture is in Yokohama Local Meteorological Observatory at Minatono-mieruoka Park.” It has been a cold week. So far we have not had many March days that reached more than 15°C for max temp. Accordingly, cherries are not yet ready for blossoming … maybe.


Violets are open.

Last week, I planned to see cherry blossoms in one of the well-known hiking courses. It was a fine warm day compared with the previous days. The spot was in the southern part of the prefecture (more to this next week), so I expected I could meet early blossoms under relaxing sunshine. Nah. Yeah, there were lots of cherry trees along the trek, but no tree had flowers. Their buds looked very tight yet. When a cherry tree is ready to open its flowers, the buds have bright pale green which will be calyx supporting the petals when it‘s open. I could not find a tree reaching to this level of readyness. Sad.

Eyes tightly-shut
If all of them open, it‘ll be spectacular.

According to Dr. Hisanori Itoh, Prof. Emeritas of Kyushu Univ., when cherrys could not experience enough cold days of winter, they feel groggy even when spring comes. So, they cannot burst out their flower, but start to open them in a protracted way. For the worst case scenario, before all the flowers open the temperature reaches the level of early summer, and so the cherrys fail to acomplish full bloom. In Hachijojima Island 八丈島, this is already happening, and people cannot enjoy the spectacle there. I don‘t think we are at this stage in Kanagawa Prefecture yet. But still ...

They are all cherrys.

Please keep crossing your fingers for me to be able to tell my adventure next week with cherry blossoms.

Wind flowers were already open.

If you find environmental issues in Kanagawa Prefecture, please make a contact with Kanagawa Natural Environment Conservation Center 神奈川県自然環境保全センター

657 Nanasawa, Atsugi City, 243-0121

〒243-0121 厚木市七沢657

Phone: 046-248-0323 You can send an enquiry to them by clicking the bottom line of their homepage at http://www.pref.kanagawa.jp/div/1644/

Sunday, March 17, 2024

Study ctd.: FY2023 results for Citizen’s River Monitoring in Kanagawa Prefecture

 


Since 2007, Kanagawa Prefecture mobilizes citizen volunteers to monitor water source rivers of Sagami 相模川 and Sakawa 酒匂川 Rivers (; my post on October 28, 2022). Every February, the researchers for the Prefecture at Kanagawa Environmental Research Centre 神奈川県環境科学センター preside two report sessions that tell us the collected results from volunteers’ studies during a fiscal year. According to this year’s session, we are 156 citizen monitors, the biggest number in 18 years of the project. We checked 48 points on Sagami and Sakawa Rivers. Unfortunately (or not), we did not find critically endangered species this fiscal year. Among the findings, Mr. Hasebe of the Environmental Research Center said the checking of Japanese fluvial sculpin is probably increasing. The fish lives only in the purest water. So, we in Kanagawa Prefecture procure water of improving quality seeping out from our forest. The other day, I’ve heard we in Kanagawa Prefecture pays the lowest tariff for tap of water thanks to these within-prefecture water sources. We must be grateful of it.

We’re collecting our specimen.

Kanagawa Prefecture gives scores for several indicator families of aquatic creatures, which shows the water quality where the animal lives. The numbers are adjusted to Kanagawa’s river from the Japanese Biological Monitoring Working Party (BMWP) published in 2017 from the Ministry of Environment. Japanese BMWP itself is modified for Japan based on English version started in 1976. We identified our catch under microscopes, and if it has a defined point, we record it in the report. The observations’ numbers are summed up, then we divide the total by the number of species we’ve recorded. We do the math like

(Kamimuria quadrata’s score + Perissoneura Paradoxa’s score + Oyamia gibba’s score + Epeorus latifolium’s score) / (Number of species in this equation, i.e. 4)

= (9+9+9+9) / 4

= 9

Perfect score is 10, which says the stream has impeccable quality. 9 is the second highest grade. For fiscal 2023, the best scored point, 8.15, was at ASL950m confluence of Mizuhi Stream ミズヒ沢 and Shijuhasse River 四十八瀬川 on the slope of Mt Nabewari 鍋割山 (ASL 1272m). Our study in Yadoriki Stream 寄沢 earned the 2024 second position with score 8.11 at ASL425m confluence of Yadoriki and Takigoh 滝郷沢 Streams. Not bad.

The score 8.11

I’ve found a sort of “???” in the score calculation. Because of the math, a place, where we have found only a small number of creatures but each of them had a higher score, earns good evaluation. Let’s call this place A. Take another place, call it B which records more species including all the animals found in Place A + the other insects et al of lower score. Then, the evaluation of Place B can be lower than Place A … I also noticed compared with the last year’s expedition I did alone in Yadoriki Stream, in FY 2023 adventure with tons of help from the fellow Forest Instructors, we’ve recorded more families of aquatic animals. Power of number in this regard. OK, but the final score becomes lower. Let’s be philosophical, and read the earned grade with a pinch of salt. The pros in Kanagawa Environmental Research Centre said the computed score can be a rough indication unless the numbers are widely apart. Roughly, roughly, if the score is higher than 7, we can regard the water quality good for tap of water. Oh, caution. Yeah, we can drink them in mountains if you like. But we can find such several tiny water animals that can be identifiable only with microscopes and their DNAs are floating freely. Moreover, there are lots of wild animals roaming in the forest of Kanagawa. They don’t hesitate pee and poop near the streams. Your cup of water procured from the stream in deep mountain surely has such ingredients. Allow them going down to your stomach? It’s your choice!

A bit of photo gallery I’ve taken from the specimen.
It’s stonefly.
I always think the pattern of their back is so artistic.

Caddisfly.
Don’t you think it’s cute?
The thing next to the bug is its home.
I tell you it’s so difficult to destroy.

Hexatoma sp.
When it becomes adult,
it is like a large mosquito (but doesn’t bite).
 I personally think it is also very cute,
like a fluffy doll. 😍

Leuctridae.
By the way, I took all these phots with Google Pixel.
 Though it does not have macros camera,
 it does this good job. 😉

The result from environmental DNA is also very interesting. There are several mismatches. Some families of animals have been catalogued as specimen, but no e-DNA result, or vice versa. Yeah. We made specimen roughly 100m long area of stream, but DNA was collected from just one pin-point place. That could make a difference for sure. Also, there are lots of DNAs found for non-aquatic insects. Mr. Hasebe said “If an ant fall in the stream, and madly swam for survival, its DNA can be found, right?” Hm. Yeah, it’s a likely scenario. Mammalian DNAs are also found. Boar and Masked palm civet. DNA keeps its form in non-refreg aquatic environment for about an hour or so. Maybe, their pee and/or poop is constantly dissolving in stream … or, their hair? Carcass floating? Actually, the scholars are trying to collect environmental DNA for non-aquatic animals as well. A group tried to gather DNA from morning dews on leaves. Another tried adhesive handy cleaner on soil. Who knows same time next year, we may be given a new tool to collect DNA from another place? Let us see …

Stabilizing the collected DNA in a filter with chemical.

Oh, recently, I’ve learned one way of calculating opening of cherry blossoms in higher altitudes. It’s like

A day of beginning cherry blossoms in a place ASL X m

= A day of beginning blossoms in a nearby seaside + X*(2 or 3)/100

i.e. a place of 100m higher altitude will have 2 to 3 days delay in opening flowers. I’ll try this formula to plan this year’s cherry blossom hiking. 😊




For the issues of river monitoring in Kanagawa Prefecture, please make a contact with Kanagawa Environmental Research Center 神奈川県環境科学センター

1-3-39 Shinomiya, Hiratsuka City, 254-0014
〒254-0014平塚市四之宮1-3-39

Phone: 0463-24-3311
FAX: 0463-24-3300

k-center@k-erc.pref.kanagawa.jp

https://www.pref.kanagawa.jp/docs/b4f/index.html

Sunday, March 10, 2024

Baby Boar’s Hands: Polystichum polyblepharum in Niiharu Citizen Forest 新治市民の森

 


Spring is coming. Winter buds are unfurling even under occasional snow showers. Plum flowers are already falling. We must be ready for cherry blossoms in a couple of weeks. Niiharu Citizen Forest 新治市民の森 is not an exception. We Lovers are finding lots of frog eggs in ponds. “Don’t you think it’s a bit earlier than usual?” “Yeah.” “And I’ve found not only the eggs of Montane brown frogs (my post on March 31, 2023). There are lots of eggs for toads.” “Me too!” Surely, spring is coming. Another light-hearted news. Polystichum polyblepharum is back. Let me explain.

Many kinds of eggs

These days we have been worrying the health of a part of Niiharu Forest where ferns are covering the ground beneath the afforested cedars. When the spot was a private property years ago, the landlord planted lots of Japanese cedars which loved humid environment like here in a valley along small stream from springs. Inevitably, the place was also favored by ferns, especially humidity enjoying Polystichum polyblepharum. Then, after Typhoon Hagibis in 2019 when lots of cedars there were damaged, we noticed apparent decline in the colony of Polystichum polyblepharum. “Hmmmmm … in any case, we had to deal with the broken and fallen cedars. So, our intervention was inevitable.” “The level of humidity has been continuously declining in the slope of the hill for decades as the other side was completely developed for housing, right? The underground water vein was already damaged by concreated roads and housings.” “Even though, was it a right thing for us removing the fallen trees which would increase the direct sunshine coming into the valley?” The discussion is continuing …

The power of typhoon …

Yet, in 2020 6 months later of the typhoon 
Polystichum polyblepharum was yet standing …

Instead of Polystichum polyblepharum, another ferns like Arachniodes standishii that is more tolerant of drier environment began overtaking the space of Polystichum polyblepharum. Yeah, this fern is also beautiful, but I would say, its mysteriousness is a touch short of the atmosphere Polystichum polyblepharum creates. Last year, there came another theory. “Maybe, Polystichum polyblepharum is sick.” “Meaning?” “At least we have not found massive attack by caterpillars of sawflies, or leaf beetles.” “Or, they are infected by some virus (; yup, we’re in the post-COVID era) that causes the decline of the species.” “Like?” “Brown spots.” “Hmmmmmmm …” “Have you found leaves of Polystichum polyblepharum that are affected by brown spots for sure?” “Er …” We were wondering what was happening there, and if there was something we can do for that.

A year later, in 2021, from the above photo.
Could you feel a change?

And in 2022.
Don’t you think the scenery looks scarce of something?

Then, this year we’ve found in the valley lots of buds of Polystichum polyblepharum! Polystichum polyblepharum has Japanese name “Inode 猪手“ which means “Boar’s Hand.” It is said that for ancient people the buds of Polystichum polyblepharum looked like boar’s hand (foot?), and so they called the fern Inode. Early March this year we could find lots of cute boar’s hands here and there. Hurrah! “Oh, I’m so relieved to see them now!” “Last snowfall let the boughs of cedars falling on the boar’s hands. Let us clean up and help the baby to grow easily.” “Yup!” We did a little bit of cleaning over the head of the buds of Polystichum polyblepharum. Maybe, their previous ones were old enough to show apparent decline. Now, they are recovering with seedlings. I’m not sure if the kids of Polystichum polyblepharum can grow up beautiful adults. If our speculation on the changes in water vein is apt, they may have difficulty in survival. Yet still … I’m keep crossing my fingers for our concern being needless anxiety because due to human short temper, not out of the calm flow of forest time … Cherry blossoms are coming!

A baby is born!

Lots of babies!


If you find a problem in the greenery of north-half of Yokohama, please make a contact with

Office for the Park Greeneries in the North
北部公園緑地事務所
Yokohama Municipal Government Creative Environment Policy Bureau
横浜市環境創造局

Phone: 045-311-2016
FAX: 045-316-8420