2012 Fiscal Year Final Research Report
Empirical research for nutrients runoff from a forested catchment during heavy rain or typhoon
| Project/Area Number |
22580169
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Forest science
|
|---|
| Research Institution | Forestry and Forest Products Research Institute |
|---|
Principal Investigator |
SHINOMIYA Yoshiki 独立行政法人森林総合研究所, 立地環境研究領域, 主任研究員 (20353716)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
OHDOSHI Kunio 高知大学, 農学部, 教授 (00127060)
|
|---|
| Project Period (FY) |
2010 – 2012
|
| Keywords | 森林 / 気候変動 / 豪雨 / 台風 / 栄養塩 / 窒素 / 微細土砂 |
|---|
| Research Abstract |
We investigated nutrients runoff (Suspended solid material, SS; Total nitrogen, TN; Nitrate, NO3 -) from a forested, mountainous catchment in the Shimanto River headwaters, comparing among “event”(total rainfall below 200 mm), “storm event” (total rainfall 200 ～ 300 mm) and “extreme storm event“(total rainfall 742 mm in 18-19 July, 2011). The vegetation of the experimental catchment (73ha), underlying sedimentary rock, is a secondary forest of predominantly evergreen trees. Stream water was collected every two hours using an automatic water sampler for 6 flood events (total rainfall 53 ～ 742 mm). TN runoff during “extreme storm event” (about 5 kg ha-1 yr-1) is equaled to the averaged value of annual TN runoff (4.9 kg ha-1 yr-1) reported by previous studies. The proportion of NO3 --N to TN for specific cumulative output drastically decreased from 28 ～76 % in “event” and“storm event” to 2 % in “extreme storm event”. It revealed definitely that particulate matter runoff overwhelmingly more than dissolved matter for nitrogen during “extreme storm event”.
|
Research Products
(10 results)
