干旱区生态环境知识资源中心(Arid): 乌兰布和沙区绿洲农田土壤钾素特征及其对土壤性质的响应

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	乌兰布和沙区绿洲农田土壤钾素特征及其对土壤性质的响应
其他题名	Characteristics of Soil Potassium in Oasis Farmlands of the Ulanbuh Sandy Areas
	包耀贤 1; 徐明岗 1; 赵志强 2; 徐军 3; 张瑞 3
来源期刊	西北农业学报
ISSN	1004-1389
出版年	2011
卷号	20 期号:8 页码:168-174
中文摘要	通过土样测定,利用统计分析方法系统研究乌兰布和沙区绿洲农地钾素的特征、时间动态及其对土壤性质的响应。结果显示,变异系数速效钾最高(42.49%),全钾最低(13.66%),各形态钾素整体分布不均;绝大多数钾素含量表现为表层低于下层且差异不显著。籽瓜、油葵、番茄和紫花苜蓿地表层速效钾平均含量属中等水平,而玉米、花葵和对照地属缺钾水平;若以有效性钾含量判定则研究区钾素供给充足。表层缓效钾含量均属中上水平,缓效钾平均转化率为22.02%,其中,紫花苜蓿地最高(24.40%),籽瓜地最低(18.91%)。表层全钾平均含量为19.20 g/kg,其中,速效钾占0.55%,缓效钾占2.85%,矿物钾占96.60%。在时间动态上,速效钾、有效性钾和缓效钾含量呈先增后降的二次曲线模型,峰值临界年限分别为21、18和17 a。全钾、矿物钾、有效性钾、缓效钾、碱解氮、物理性粘粒、CaCO3和阳离子交换量(CEC)通过直接和间接效应综合影响速效钾含量,可解释总变异量的78.9%。
英文摘要	Through measuring soil samples of different oasis farmlands in the Ulanbuh sandy areas,using statistical analytical method,the characteristics,evolution process and influence factors (soil properties)of soil potassium were studied systematically.The results showed that the variation coefficient of readily available potassium(RAK)was the highest(42.49%)and that of total potassium(TK)was the lowest(13.66%),and which meant that the contents of various potassium were overall uneven distribution.The overwhelming majority of various potassium contents of topsoil (0-20 cm)was lower than the subsoil(20-40 cm)and there had no significant difference between vertical layers.RAK average content of topsoil belonged tomediumlevel in farmlands of seed watermelon,oil sunflower,tomato and alfalfa,and lacking in farmlands of corn,sunflower and control.Judging by the content of available potassium (AK),and potassium supply was abundant in study areas.Average content of slowly available potassium (SAK)in topsoil belonged toabove averagelevel in all farmlands,and average conversion of SAK was 22.02%,among them,the average conversion of farmland in alfalfa and seed watermelon was the highest(24.40%)and lowest(18.91%)respectively.TK average content of topsoil was 19.20g/kg,among them,the proportion of RAK,SAK and mineral potassium (MK)took up respectively 0.55%,2.85% and 96.60%.The evolution processes of RAK,AK and SAK with time were simulated quadratic curve model,which increased firstly and decreased subsequently over time,the peak critical time was respectively about 21 years,18 years and 17 years.The content of RAK was influenced directly and indirectly by TK,MK,AK,RAK,SAK,available N,physical clay,CaCO3and CEC,and they could explain significantly 78.9% of the total variance of them.
中文关键词	乌兰布和沙区 ; 绿洲农田 ; 土壤钾素 ; 土壤性质
英文关键词	Ulanbuh Sandy Areas Oasis farmland Soil potassium Soil property
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:4316533
来源机构	中国林业科学研究院沙漠林业实验中心
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227229
作者单位	1.中国农业科学院农业资源与农业区划研究所, 北京 100081, 中国; 2.广东省水利电力规划勘测设计研究院, 广州, 广东 510635, 中国; 3.中国林业科学研究院沙漠林业实验中心, 蹬口, 内蒙古 015200, 中国
推荐引用方式 GB/T 7714	包耀贤,徐明岗,赵志强,等. 乌兰布和沙区绿洲农田土壤钾素特征及其对土壤性质的响应[J]. 中国林业科学研究院沙漠林业实验中心,2011,20(8):168-174.
APA	包耀贤,徐明岗,赵志强,徐军,&张瑞.(2011).乌兰布和沙区绿洲农田土壤钾素特征及其对土壤性质的响应.西北农业学报,20(8),168-174.
MLA	包耀贤,et al."乌兰布和沙区绿洲农田土壤钾素特征及其对土壤性质的响应".西北农业学报 20.8(2011):168-174.