| 包耀贤,吴发启,贾玉奎,宋芳云.黄土丘陵沟壑区人工农田土壤钾素特征研究[J].干旱地区农业研究,2008,(2):1~6 |
| 黄土丘陵沟壑区人工农田土壤钾素特征研究 |
| Research on characteristics of soil potassium of artificial farmland in loess hilly region |
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| DOI：10.7606/j.issn.1000-7601.2008.02.01 |
| 中文关键词: 坝地 梯田 土壤钾素 黄土丘陵沟壑区 |
| 英文关键词:dam land terrace soil potassium loess hilly region |
| 基金项目:中国科学院知识创新项目“黄土高原农果复合型生态经济建设模式试验示范研究”(KZCX2-XB2-05-01) |
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| 中文摘要: |
| 通过土样分析,利用统计分析法系统研究了黄土丘陵沟壑区人工农地——坝地和梯田的土壤钾素含量、相关性、垂直和时空分异特征。研究结果表明:坝地和梯田钾素分布严重失衡;表层速效钾平均含量坝地属“中等”,梯田属“缺乏”;表层全钾平均含量坝地属“较高”,梯田为“中等”;缓效钾平均是速效钾的7.58倍(坝地)和11.06倍(梯田),但转化率较低;矿物钾平均占全钾的95.71%(坝地)和95.16%(梯田),却难以被作物利用。土壤各形态钾素间都呈极显著正相关,并受土壤有机质、CEC、pH值和颗粒组成的影响。表层与下层间的速效钾、坝地和梯田间的缓效钾都有极显著差异,但黄土母质土壤钾素整体分布均一;坝地速效钾沿剖面向下含量增加,且整体高于梯田;坝地因高耗钾作物玉米而导致缓效钾含量低于梯田。土壤有效性钾、速效钾和缓效钾在时间动态上都表现为先增后降,分水岭年限坝地约在40 a,梯田约在30 a。 |
| 英文摘要: |
| Through analyzing soil samples and using statistical analytical method,characteristics on contents,correlations and vertical and temporal distributions of soil potassium for artificial farmland — dam land and terrace in loess hilly region were studied systematically.The results showed imbalances of soil potassium were serious in dam land and terrace.Average content of readily available potassium(RAK) of topsoil belonged to “medium” level in dam land and lacking in terrace.Average content of total potassium(TK) of topsoil belonged to “higher” level in dam land and “medium” level in terrace.Average content of slowly available potassium(SAK) was respectively 7.58 times and 11.06 times of that in RAK in dam land and terrace,but its transition ratio was low.Average content of mineral potassium(MK) took up respectively 95.71%(dam land) and 95.16% (terrace) of that in TK and it was difficult to be utilized by crop.The interrelations between various soil potassium were very significant positive correction,and they were influenced by organic matter,CEC,pH value and particle size distribution of soil.Very significant differences were found for RAK in top layer and lower layer of soil profile and for SAK in dam land and terrace.As a whole,soil potassium of loess parent material was even.The content of RAK for dam land increased from upper to lower in vertical profile and was wholly higher than that of terrace.The content of SAK in dam land was lower than that of terrace because of depletion for maize.In the process of temporal change,available potassium,RAK and SAK increased firstly and decreased subsequently,and the critical time was about 40 years in dam land and 30 years in terrace. |
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