干旱区生态环境知识资源中心(Arid): 黄绵土坡耕地磷素迁移与土壤退化研究

Arid

	黄绵土坡耕地磷素迁移与土壤退化研究
其他题名	Study on Transport of Phosphorus and Soil Degradation of Loessial Soil on Slope Land
	李裕元 1; 邵明安 1; 郑纪勇 2; 张兴昌 2
来源期刊	水土保持学报
ISSN	1009-2242
出版年	2003
卷号	17 期号:4 页码:1-7
中文摘要	坡地水土流失是导致区域土壤质量退化与土地生产力下降的重要原因。采用野外天然降雨-径流小区试验法，初步研究了黄土高原黄绵土休闲坡耕地一次轻度侵蚀（侵蚀量410 ～ 435t/km~2）降雨前后土壤质量的退化特征。试验结果表明，降雨侵蚀前后坡地表层（0 ～ 5cm）土壤性质均具有相似的波状变化特征，其中 > 50mum砂粒含量与50 ～ 20mum微团聚体含量随坡长的增加呈降低趋势，而粘粒含量、比表面积（SSA）、20 ～ 2mum 微团聚体含量、土壤有效磷（AP）与全磷（TP）含量以及土壤含水量均为增大趋势，表明由于长期处于侵蚀环境表层土壤的细颗粒与养分逐渐向坡下迁移，坡地土壤在向质地沙化和肥力退化方向发展。统计分析表明，坡地土壤AP与TP含量均与土壤粘粒含量及SSA呈显著正相关，TP含量与20 ～ 2mum微团聚体含量呈显著正相关。坡地土壤性质在降雨前后的变化不如其沿坡面的空间变化呈显著，但是坡地土壤与径流泥沙的分析结果仍然显示出，降雨主要导致有效养分（AP）、< 20mum细颗粒以及20 ～ 2mum微团聚体在坡面的迁移与流失，这正是坡地土壤质量退化的主要原因。
英文摘要	The loss of soil and water from slope land is the major causes of regional soil degradation and decline of land productivity. By the method of natural rainfall-runoff plot experiments in field, a preliminary study on the characteristics of loessial soil degradation on a slope scale was conducted on a fallow slope land in the Loess Plateau before and after a light erosion rainfall event with erosion quantity 410~435 t/km~2. Experimental results showed that the soil properties similarly fluctuated along slope surface (0~5 cm) both before and after rainfall. Sand(50mum) content and 50-20mum micro-aggregate content (MA.) tended to decline down from the top to the bot-tom of the slope, while soil clay(<2mum) content (CI), specific surface area (SSA), 20~2mum MA? soil avail-able phosphorus (AP) and total phosphorus (TP) contents, as well as soil moisture tended to increase. This sug-gested that soil material and nutrients gradually transported from the top to the bottom of the slope due to situat-ing in an erosion environment for a long term, and, consequently, soil varied to the direction of desertification in texture and degradation in fertility. Statistical analysis showed that soil AP and TP contents were positively corre-lated with Cl and SSA in the surface soil (0~5 cm) and that TP content was positively correlated with 20~2 mum MA. Therefore the major causes of soil degradation on slope surface were the loss of clay and fine MA (20~2mum). The change of soil properties before and after rainfall was less significant than their spatial change along the surface, however, the analytical results of slope soil and sediment still showed that rainfall induced the transport and loss of soil available nutrients (e. g. AP), fine particles (<20mum) as well as 20~2mum MA, and this is just the major causes of soil quality degradation.
中文关键词	坡地 ; 降雨侵蚀 ; 土壤退化 ; 颗粒组成 ; 微团聚体 ; 磷素 ; 土壤水分
英文关键词	slope land rainfall erosion soil degradation soil particle composition micro-aggregate phosphorus soil water
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:1172110
来源机构	中国科学院地理科学与资源研究所 ; 中国科学院水利部水土保持研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204374
作者单位	1.中国科学院地理科学与资源研究所, 北京 100101, 中国; 2.中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨陵, 陕西 712100, 中国
推荐引用方式 GB/T 7714	李裕元,邵明安,郑纪勇,等. 黄绵土坡耕地磷素迁移与土壤退化研究[J]. 中国科学院地理科学与资源研究所, 中国科学院水利部水土保持研究所,2003,17(4):1-7.
APA	李裕元,邵明安,郑纪勇,&张兴昌.(2003).黄绵土坡耕地磷素迁移与土壤退化研究.水土保持学报,17(4),1-7.
MLA	李裕元,et al."黄绵土坡耕地磷素迁移与土壤退化研究".水土保持学报 17.4(2003):1-7.