划破草皮对不同地形高寒草甸草原土壤特征及地下生物量的影响

发布时间：2018-02-05 21:12

本文关键词： 高寒草甸草原划破草皮不同地形土壤特征地下生物量　出处：《草业学报》2016年06期 　论文类型：期刊论文

【摘要】：在青藏高原东缘东祁连山高寒草甸草原开展平地划破草皮和缓坡地划破草皮试验,研究了划破改良措施对土壤特征及地下生物量的影响。结果表明,划破干扰对土壤含水量和土壤紧实度的影响主要体现在7-8月,在此期间划破干扰对平地的改良效果均显著优于缓坡地;划破初期,划破干扰减小了平地与缓坡地划破沟内表层地下生物量,但经过4个月的生长季,划破改良显著增加了平地表层土壤地下生物量,而缓坡地表层土壤地下生物量反而较其对照区有所减小;划破处理可以有效增加平地各个土层有机碳含量,而对于缓坡地,反而降低了表层土壤有机碳含量。研究证实,平地划破草皮措施有利于生产力较低的高寒草甸草原禾草-嵩草草甸的综合改良,但划破草皮措施对以嵩草为优势种的缓坡地草甸草原需谨慎使用。
[Abstract]:In the eastern Qilian Mountains alpine meadow grassland of the eastern margin of Qinghai-Xizang Plateau, the experiments were carried out to study the effects of soil characteristics and below-ground biomass on soil characteristics and below-ground biomass. The effect of breaking disturbance on soil moisture content and soil compactness was mainly reflected in July-August, during which the effect of sloping disturbance on the improvement of flat land was significantly better than that on gentle slope land. In the early stage of cutting, the surface surface biomass of flat land and gentle slope was decreased, but after 4 months of growing season, the surface soil underground biomass of flat soil was significantly increased by breaking and improving. On the contrary, the underground biomass of surface soil in the gentle slope was lower than that in the control area. Cutting treatment can effectively increase the organic carbon content in each soil layer of flat land, but for gentle slope land, it can reduce the organic carbon content of surface soil. The cutting of grassland on flat land is beneficial to the comprehensive improvement of grass grass and Kobresia humilis meadow in alpine meadow with low productivity, but it should be used carefully in the meadow grassland with Kobresia humilis as the dominant species.
【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发展研究中心;
【基金】：国家自然科学基金(31360569) 现代农业产业技术体系(CARS-35) 甘肃省农牧厅“退牧还草科技支撑项目”;“青藏高原打草场建设项目”资助
【分类号】：S812

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