干旱区生态环境知识资源中心(Arid): 不同利用强度下绿洲农田土壤微量元素有效含量特征

Arid

	不同利用强度下绿洲农田土壤微量元素有效含量特征
其他题名	The availability of trace elements in an oasis soil under different utilization intensity in an arid area in China
	李海峰; 曾凡江; 桂东伟; 雷加强; 张利刚; 郭永平; 热甫开提·沙比提
来源期刊	生态学报
ISSN	1000-0933
出版年	2012
卷号	32 期号:6 页码:1803-1810
中文摘要	以地处极端干旱背景下的塔里木盆地南缘策勒绿洲为研究区,以绿洲化为视角,根据当地农民耕作习惯于2005年选择4块试验农田,分别代表当地典型的农田利用强度。基于单项指数(E_i)和综合指数(E_c)相结合的评价方法,分析了绿洲农田在不同利用强度下的土壤Fe、Cu、Mn、Zn等微量元素有效性,探讨了土壤微量元素与人为耕作管理措施之间的关系。结果表明:人为耕作管理强度会对土壤微量元素有效含量产生重要影响,绿洲不同位置农田因施肥强度和管理方式的差别,其土壤微量元素有效含量特征存在显著差异。绿洲内部农田土壤有效Fe、Cu、Mn、Zn含量显著高于绿洲边缘各样地,新垦农田土壤有效Fe、Cu、Zn含量均低于对照样地;绿洲内部农田土壤微量元素有效性最高,新垦农田最低;农田土壤微量元素有效性与土壤有机质存在显著的正相关关系。
英文摘要	Trace elements are important components of soil and their characterization is necessary for determining soil quality.Farming practices can change soil properties,thereby altering the effectiveness of the soil trace elements present.Soil trace element research in extremely arid regions,aiming at the determining effects of different land uses,has received little attention until now.The Cele Oasis(80°03′24-82°10′34E,35°17′55-39°30′00N) located on the southern margin of the Tarim Basin,Xinjiang,China,was selected as a study area.Agriculture is the main land use here;however,management intensities differ across the oasis and as the oasis area has grown.In 2005,four experimental fields were selected,representing typical land use types according to local tillage practices.These were newly cultivated,fertilized land(NEF),a field receiving a normal manure application rate(NMF),a field receiving a high manure application rate(HMF) and a field in the Oasis interior(OIF).A single index(E_i) and integral index(E_c) were calculated to evaluate the effects of these land use types on soil trace element availability over 20cm depths.The relationship between soil organic matter and available trace elements was determined by correlation analysis.Our results showed that:(1) There were statistically significant differences in the amounts of available Fe,Cu,Mn,Zn present in the different land uses at a depth of 020 cm.Cultivation management can improve the accumulation of soil organic matter and soil particle size distribution,which in turn can increase the availability of soil trace elements to pasture and crops.The application of manure and fertilizer being the main source of available trace elements in these soils was the probable reason for the differences.(2) The farmland(OIF) situated in the oasis interior showed the highest level of trace element availability of all the fields.The main reason for this result would likely be that long-term irrigation has played an important role in altering the availability of soil trace elements,while more than one hundred years of careful cultivation management had led to the soil becoming more fertile.(3) A comparison of the unfertilized treatments(i.e.NEF,situated in the edge of the oasis and CTP) showed that the lowest concentrations of available Fe,Cu,Zn,were found in the NEF treatment,which was probably due to the removal of these micronutrients from the soil through crop uptake and harvest.(4) Fertilization of the NMF and the HMF fields(which are also situated in the desert-oasis ecotone) resulted in a positive effect on soil trace element concentrations;the available indices of Fe,Cu,Mn and Zn in the HMF were higher than in the NMF,because of the higher input of manure(see earlier).(5) The results of a correlation analysis indicated that soil organic matter was highly positively correlated with the availability of the soil trace elements,the soil organic matter exerting a significant and direct effect on the availability of Zn,Mn,Fe and Cu in the process of oasis growth.These results indicate that refining agricultural management practices in the process of oasis growth could be beneficial.
中文关键词	干旱区 ; 农田 ; 土壤微量元素 ; 绿洲
英文关键词	arid area farmland soil trace elements oasis
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:4500159
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228441
作者单位	中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	李海峰,曾凡江,桂东伟,等. 不同利用强度下绿洲农田土壤微量元素有效含量特征[J]. 中国科学院新疆生态与地理研究所,2012,32(6):1803-1810.
APA	李海峰.,曾凡江.,桂东伟.,雷加强.,张利刚.,...&热甫开提·沙比提.(2012).不同利用强度下绿洲农田土壤微量元素有效含量特征.生态学报,32(6),1803-1810.
MLA	李海峰,et al."不同利用强度下绿洲农田土壤微量元素有效含量特征".生态学报 32.6(2012):1803-1810.