作者:Wu, LN (Wu, Linna)[ 1,2 ] ; Yang, ST (Yang, Shengtian)[ 1 ] ; Zhao, CS (Zhao, Changsen)[ 1 ] ; Hao, FH (Hao, Fanghua)[ 3 ] ; Dong, GT (Dong, Guotao)[ 4 ] ; Yang, YA (Yang, Yongan)[ 5 ] ; Wang, ZW (Wang, Zhiwei)[ 1 ] ; Lou, HZ (Lou, Hezhen)[ 1 ]

FRESENIUS ENVIRONMENTAL BULLETIN

卷: 25  期: 10  页: 3847-3858

出版年: 2016

摘要

An understanding of the monthly variation of total soil nitrogen (TN) and ammonium nitrogen (N-NH4+) content under different types of land-use change is crucial to sustainable agricultural management, yet few studies have investigated this process at mid-high latitudes. In order to examine this, we compared the monthly variation of TN and N-NH4+ content for land that had undergone different land-use changes in a typical mid-high latitude agricultural region in Northeast China. The study was based on an ecohydrological model (EcoHAT). The model was forced by multi-source remote sensing data and validated using 106 soil samples collected from in-situ sites. The region was classified into seven land-use types, four of which were converted and three of which were unconverted. The converted types included dry land to paddy field (D2P), wetland to dry land (W2D), wetland to paddy field (W2P), and forest to dry land (F2D). The unconverted types included permanent dry land (D2D), permanent wet land (W2W), and permanent forest land (F2F). Results revealed the following: (1) the monthly increment rate of TN and N-N114+ for converted land-use types was greater than for unconverted land-use types in a given month; (2) during the change period, the increment rate of TN for D2P from April to August was the highest of the all land-use types, and the increments and decrements of N-NH4+ in D2P were the highest for any land-use change from April to July and from July to October, respectively; and (3) the TN level decreased with the exception of W2D, while the N-NH4+ level increased after agricultural expansion. The rate of TN in D2P was clearly lower than 10.0% in April and was 8.5% in August compared to that of permanent dry land, while the increment rates of monthly N-NH4+ in F2D compared with F2F were 41.7% in April, 127.6% in July, and 97.6% in October, which was higher than for D2P (compared to D2D) and W2D and W2P (compared to W2W). These comparisons provided important new evidence of demonstrating the beneficial effects of sustainable agricultural development in mid-high latitude agricultural regions.

通讯作者地址: Zhao, CS (通讯作者)

Beijing Normal Univ, Sch Geog, State Key Lab Remote Sensing Sci, Beijing Key Lab Remote Sensing Environm & Digital, Beijing 100875, Peoples R China.

地址:

[ 1 ] Beijing Normal Univ, Sch Geog, State Key Lab Remote Sensing Sci, Beijing Key Lab Remote Sensing Environm & Digital, Beijing 100875, Peoples R China

[ 2 ] Guizhou Univ, Coll Resource & Environm Engn, Guiyang 550025, Guizhou, Peoples R China

[ 3 ] Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100875, Peoples R China

[ 4 ] Yellow River Inst Hydraul Res, Zhengzhou 450003, Peoples R China

[ 5 ] Jiansanjiang Adm Agr Reclamat Heilongjiang Prov, Agr Technol Promot Ctr Bawujiu Farm, Jiansanjiang 156326, Heilongjiang, Peoples R China