San Joaquin Delta

Study finds restoring wetlands can lessen soil sinkage, greenhouse gas emissions

Restoring wetlands can help reduce or reverse soil subsidence and reduce greenhouse gas emissions, according to research in California’s Sacramento-San Joaquin River Delta by Dartmouth College researchers and their colleagues.

The study, which is one of the first to continually measure the fluctuations of both carbon and methane as they cycle through wetlands, appears in the journal by Global Change Biology.

Worldwide, agricultural drainage of organic soils has resulted in vast soil subsidence and contributed to increased atmospheric carbon dioxide concentrations. The California Delta was drained more than a century ago for agriculture and human settlement and has since experienced subsidence rates that are among the highest in the world. It is recognized that drained agriculture in the Delta is unsustainable in the long-term. To help reverse subsidence and capture carbon, there is interest in restoring drained agricultural land-use types to flooded conditions, but flooding may increase methane emissions. Carbon dioxide is the primary greenhouse gas emitted through human activities, but pound for pound, methane’s impact on climate change is more than 20 times greater than carbon dioxide.

Researchers at Dartmouth, UC-Berkeley and UC-Davis installed monitoring equipment on three moveable four-meter towers, measuring carbon dioxide and methane concentrations above a pasture and a cornfield that had been drained and a flooded rice paddy, a newly restored wetland and a wetland that underwent restoration in 1997. They found that the drained sites were net carbon and greenhouse gas sources. Conversely, the restored wetlands were net sinks of atmospheric carbon dioxide, but they were large sources of methane emissions, says co-author Jaclyn Hatala Matthes, an assistant professor an assistant professor in Dartmouth’s Department of Geography. “However, we do expect that the methane emissions will stabilize over time,” she says. “We’ve seen that emissions tend to increase for the first few years, and that this increase is correlated with the increase in wetland plant growth and spread during this time.”

Read more here.

Image credit: Mathew Grimm

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100 years ago today, Willis Linn Jepson was exploring the Middle River in the San Joaquin Delta.

Here’s what he says about the trip:
Went to Middle River today with Prof. Gregg on invitation of J.A. Sanford of Stockton.We were met by Sanford, Brown of Stockton, Ollahan, an expert on produce from Stockton and a wholesaler, and Filcher (Roy Welton), class of 1906, Berkeley. It was a very beautiful day and we had a fine time in a launch cruising about the islands. The day was very brilliant and the willows still in foliage.

The scanned field books are pictured above (as is Jepson, in a photo from 1911).

Jepson’s field notebooks have been scanned and are available online here.

Do you want to help?

We would like to increase the accessibility of Jepson’s field books. Because the field books are handwritten, the contents cannot be indexed by the Web search engines. If users are willing to transcribe the pages, however, little by little a great deal of information will be made widely available and searchable. We have built some simple tools with which you can associate a transcription with a page, or accumulate key-words.  Already volunteers have translated over 4400 pages! There are transcription links at the bottom left and right of each field book image page. We invite you to help make Jepson’s observations available to the world.

Happy transcribing!

Thanks to our awesome archivist, Amy Kasameyer, for the idea and the images!

Assemblymember Frazier Responds to Announcement of Additional Aquatic Weed Treatment Around Discovery Bay

Sacramento, CA – State officials today announced more treatment plans to deal with aquatic weeds choking waterways in and around Discovery Bay.

“Our voices were heard,” Assemblymember Jim Frazier, D-Oakley, said upon learning that the California State Parks Division of Boating and Waterways (DBW) will begin its 2015 Egeria densa Control Program on March 9 and will simultaneously treat curly-leaf…

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Announced the #Chabot men’s playoff game tonight against San Joaquin Delta. Unfortunately they lost, but I was able to do the game with a cold and I finally got some extra cash in my pocket. Gonna be back out tomorrow evening for the women’s playoff game! #CCCAA #Basketball #WorkingHard

Whats up you guys. Hope everyone is a having an awesome day so far!! During the weekdays, mostly in the mornings. I’m attending at San Joaquin Delta College. Here is a shot of my friend @iv.arlenne at the mathematics and science building. Who knew our campus could look this cool. Thank you guys and have a wonderful day :)

Guest Instagrammer: @mirandolaluna #IGersStockton (at San Joaquin Delta College - Cunningham 428 - Pride Center)

Ethnic jewelry: vintage and modernity

'Bad Jews': grandpa dies, family implodes

The central argument in “Bad Jews” is over the piece of male religious jewelry — a chai — that Poppy has left to the oldest cousin, Liam Haber (Michael Steinmetz). There is little financial value in the piece but lots of primal family history. Poppy

Jewelry theft ring targets South Asian households

BALLWIN, Mo. () — Out-of-state criminals have made their way into the St. Louis area and are targeting the homes of one specific ethnic group. According to St. Louis County Police, the thieves are tracking down the homes of South Asian

Jewelry Art & Gift Fair by San Joaquin Delta College Fashion Club

It’s time for San Joaquin Delta College’s Semi-Annual Art & Gift Fair, hosted by Delta College’s Fashion Program. Shop gifts and goodies from local artisans selling everything from handmade and vintage accessories, sterling silver jewelry & ethnic

The week’s odd news: Llamas run loose, set social media atwitter

She tells the Butler Eagle that horse hair is used to make jewelry and tail and main extensions for show horses. The hair can even be used to make brushes, violin bows, hat bands and wigs. Shipley believes the horse barber The name, proposed by

Cash-rich Chinese crowd South Korean shopping malls

Chinese shoppers frequently visit Seoul’s high-end department stores and have been known to spend tens of thousands of dollars on expensive watches, jewelry and accessories, South Korea’s Herald Business reported. Chinese tourists are also traveling to 

Ethnic jewelry: vintage and modernity
DWR: State Water Project Deliveries Increased Slightly

SACRAMENTO – Few storms have graced California so far this winter, but those that did – in mid-December and early February – will allow the California Department of Water Resources (DWR) to increase water deliveries to most customers of the State Water Project (SWP) by an additional 204,000 acre-feet (AF).

The modest increase in SWP allocation amounts to enough water to meet the needs of…

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Suisun Marsh, CA

Feb 14, 2015

Sony α7 w/ FE 28-70mm F3.5-5.6 OSS


バレンタインデーはロマンティックなことは何もせず(チョコもなかった)、うちから1時間くらいのところにある湿地帯へ繰り出して、カヌー遊びをしてきました。

実は、カリフォルニアのこのあたり(サンフランシスコ以東、ナパの南からストックトンにかけて)はでっかいデルタ地帯になっていて、かなり複雑に入り組んだ川が流れている湿地帯が広がってます。

Sacramento–San Joaquin River Delta

で、そのデルタ地帯で釣りをしたり、野鳥観察したり、カヤッキングをするのは結構メジャーなレクリエーションとなっているところに、折角カヌーを持ってるし、2月なのに天気が良くて20度くらいになってるしなので、ちょいとでかけてきました。

出発が遅かったし、ちょうど引き潮になるときだったのでムリはせず、2時間くらいのんびりカヌー漕いで、おにぎり食ってきました。

Herbicide Control of Water Hyacinth to Begin in the Delta in Early March

SACRAMENTO, Calif. —California State Parks Division of Boating and Waterways (DBW) issued a public notice today to begin herbicide treatment of the aquatic invasive weeds Water Hyacinth and Spongeplant in the Sacramento-San Joaquin Delta region beginning on Wednesday, Mar. 4, 2015 and continue through the end of November.

The herbicide treatment will initially focus on the following areas: Middle…

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