| 耕作方式对苜蓿(Medicago sativa)地土壤团粒的影响 |
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| 引用本文： | 崔星,师尚礼.耕作方式对苜蓿(Medicago sativa)地土壤团粒的影响[J].中国沙漠,2014,34(2):385-390. |
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| 作者姓名： | 崔星 师尚礼 |
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| 作者单位： | 甘肃农业大学 草业学院/草业生态系统教育部重点实验室/中-美草地畜牧业可持续研究中心/甘肃省草业工程实验室, 甘肃 兰州 730070 |
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| 基金项目： | 农业部行业专项(nyhyzx07-022);牧草种质资源保护利用项目(NB2130135);国家牧草产业技术体系专项(CARS-35)资助 |
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| 摘 要： | 以甘肃干旱区连作5年和轮作1年的苜蓿(Medicago sativa)地土壤为研究对象,对不同耕作方式下土壤团粒结构、容重、含水量指标进行研究。结果表明:在轮作和连作模式下,随着土壤深度的增加,0.25mm土壤团粒质量在干筛和湿筛处理下均降低,0.25mm团粒累积质量越大,分形维数越小。在浸水条件下,粒径为0.5~0.25mm的土壤团聚体含量最高,其它粒径团聚体含量依粒径的增大而降低。轮作土壤含水量呈现先增加后降低、最后再增加的变化过程;0~60cm土层水分含量最高(13.881%),60~80cm土层含水量下降到较低值(10.343%),80~100cm土层水分迅速恢复(13.811%)。连作和轮作土壤容重随土壤深度均呈现依次增大变化,连作最大值为1.425%比最小值高出17.6%,轮作最大值1.432%比最小值高出18.7%。
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| 关 键 词： | 干旱区 分形维数 含水量 容重 轮作 连作 苜蓿(Medicago sativa) |
| 收稿时间： | 2013-09-16; |
Effects of Cropping Patterns on Soil Aggregates of Alfalfa Field |
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| Cui Xing,Shi Shangli.Effects of Cropping Patterns on Soil Aggregates of Alfalfa Field[J].Journal of Desert Research,2014,34(2):385-390. |
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| Authors: | Cui Xing Shi Shangli |
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| Institution: | College of Grassland Science/Key Ecosystem Laboratory of the Ministry of Education/Sino-US Center for Grazing land Ecosystem Sustainability/Pratacultural Engineering Laboratory of Gansu Province, Gansu Agricultural University, Lanzhou 730070, China |
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| Abstract: | By researching alfalfa soil with five years monocropping and one year rotation in arid area of Gansu, China, the study presented the soil aggregate structure, bulk density, water content under different cropping systems. It indicated that in both systems, the aggregate structure exceeding 0.25 mm under dry sieve and wet sieve treatments tended to decline in descending soil layers and the lager aggregate structures were found with smaller fractal dimensions. With wet sieve, the 0.5~0.25 mm granules were with the highest soil aggregate. In rotation, the water content was at its highest level (13.881%) at the 0~60 cm soil, and dropped to a relatively low level (10.343%) at the 60~80 cm soil, then quickly recovered to (13.811%) at 80~100 cm. The maximum of bulk density was 1.425%, 17.6% higher than the minimum in monocroping, while in rotation cropping, the maximum was 1.432%, 18.7% higher than the minimum. |
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| Keywords: | arid area fractal dimension water content bulk density rotation cropping monocropping alfalfa |
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