Soil nutrients distribution and its relation to landform and vegetation at small watershed in semiarid area
Soil nutrients distribution and its relation to landform and vegetation at small watershed in semiarid area
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发表时间：
2003
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通讯作者：
Guo Sheng
中科院分区：
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作者：
Guo Sheng
以黄土高原半干旱丘陵区中连川小流域为研究对象，研究了小流域土壤养分分布特征及其与地貌、植被沿着坡剖面的关系。结果表明，整个流域土壤养分和有效态含量均显著偏低。耕作条件下，0~20 cm土层有机碳（SOC）、全氮（TSN）、全磷（TSP）、Olsen速效磷（Olsen-P）和硝态氮（NO3-N）含量在坡背和坡顶较低，坡脚因土壤流失而富集。土壤养分的分布规律为：坡背、坡顶、坡脚。退耕还草后0~20 cm土层土壤有机碳和全氮含量显著增加。草本植物比灌木植物对土壤养分有更大的积累作用。
The study was conducted to investigate soil nutrients distribution and its relation to landform and vegetation along summit to toeslope transection at the small watershed of Zhonglianchuan in the semiarid hilly region of Loess Plateau. The results showed that both soil nutrients and available fractions were significantly low across the watershed. Under the condition of cultivation, soil organic carbon (SOC), total soil nitrogen (TSN), total soil phosphorus (TSP), OlsenP, and nitrate N in the 0~20 cm depth were low at slopeback and summit, and enriched at toeslope due to soil losses. The distribution of soil nutrients could be put in order as: slopeback summit toeslope. SOC and TSN in the 0~20 cm depth were increased significantly when the cropland was converted into grassland. Herbaceous plants caused more accumulation of soil nutrients than shrubby plants.