%0 Journal Article
%T Effects of land use type on soil organic C and total N in a small watershed in loess hilly-gully region<br>黄土丘陵区小流域土地利用对土壤有机碳和全氮的影响
%A WANG Xiao-li
%A GUO Sheng-li
%A MA Yu-hong
%A HUANG Dao-you
%A WU Jin-shui
%A <br>王小利
%A 郭胜利
%A 马玉红
%A 黄道友
%A 吴金水
%J 应用生态学报
%D 2007
%I 
%X Based on field survey and laboratory analysis, this paper studied the storage of surface soil (0-20 cm) organic C (SOC) and total N (TSN) in farmland, orchard, woodland and grassland in the Yangou watershed of loess hilly-gully region. The results showed that in the test area, the mean contents of SOC and TSN were 7.56 and 0.71 g . kg(-1), respectively. On an average, farmland had 4.67 g . kg(-1) of SOC and 0.48 g . kg(-1) of TSN, and terrace farmland had lower storage of SOC and TSN than other types of farmland. Compared with farmland, the contents of SOC and TSN in orchard had a slight decrease, being 4. 33 g . kg(-1) and 0.46 g . kg(-1), respectively, while those in grassland were higher. The average contents of SOC and TSN in woodland were 117.7% and 89.4% higher than those in farmland. In this area, the variation coefficients of SOC and TSN contents were 69.7% and 58.4%, respectively, being the highest (62.8% and 54.5%) in woodland, the second in grassland and farmland, and the smallest (18.0% and 22.9%) in orchard. Soil C/N ratio was increased in the order of orchard, farmland, grassland, woodl and. Under these four landuse types, there was a significant positive correlation between SOC and TSN (r = 0.9791). The construction of farmland and orchard didn' t increase the contents of SOC and TSN significantly, while the conversion of farmland into woodland or grassland and the hill-closure forestry promoted the accumulation of SOC and TSN distinctly.
%K land use
%K soil organic C
%K total N
%K loess hilly-gully region<br>土地利用
%K 土壤有机碳
%K 全氮
%K 黄土丘陵区
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=8A3F40A557E232D9&yid=A732AF04DDA03BB3&vid=13553B2D12F347E8&iid=B31275AF3241DB2D&sid=4CBFE0C7AFFA0387&eid=9A3A88A3A0B8496C&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=6&reference_num=17