垦殖对川西北高寒草地土壤理化性质的影响

发布时间：2018-06-16 11:16

本文选题：垦殖 + 川西北　；参考：《水土保持学报》2017年02期

【摘要】：为了解垦殖对川西北高寒天然草地土壤理化性质的影响,采用空间代替时间的方法,选择高寒草地垦殖年限为3a和10a的蔬菜地作为研究对象,以未开垦的天然草地作为对照,研究了不同垦殖年限下0—60cm土层土壤理化性质的变化特征。结果表明:人为垦殖导致天然高寒草地土壤养分含量和土壤理化性质显著下降,且随着垦殖年限的增加土壤质量进一步降低。垦殖10a后,0—60cm土层土壤容重、砂粒含量分别增加了21.1%和8.0%(p0.05),土壤含水量、有机质、全氮、速效氮、粘粒含量分别下降了38.4%,44.1%,39%,46.7%和19.2%(p0.05)。表层(0—20cm)土壤理化性质和土壤碳氮养分含量的降低最明显,随着土层的加深,土壤理化性质变化趋于减弱。0—20cm土层土壤大部分碳、氮养分的损失发生在垦殖前3a,而在底层(20—40cm和40—60cm)土壤垦殖前3a土壤碳、氮的变化未达差异水平,土壤碳、氮养分的损失主要发生在垦殖3~10a。
[Abstract]:In order to understand the influence of reclamation on the soil physical and chemical properties of cold natural grassland in northwestern Sichuan, the vegetable land of 3a and 10a of alpine grassland was selected as the research object by space replacing time. The change characteristics of soil physical and chemical properties of 0 60cm soil layer under different reclamation years were studied with the uncultivated natural grassland as the control. The results showed that the soil nutrient content and soil physical and chemical properties of natural alpine grassland decreased significantly, and the soil quality was further reduced with the increase of reclamation years. After the reclamation of 10a, the soil bulk density in the 0 - 60cm soil layer increased by 21.1% and 8% (P0.05), soil water content, organic matter, total nitrogen, available nitrogen, and clay content. The amount of soil decreased by 38.4%, 44.1%, 39%, 46.7% and 19.2% (P0.05). The surface (0 - 20cm) soil physical and chemical properties and soil carbon and nitrogen nutrient content decreased most obviously. As soil layer deepened, the soil physical and chemical properties tended to weaken most of the carbon in the.0 - 20cm soil layer, and the loss of nitrogen nutrients occurred at 3A before the reclamation, but at the bottom (20 - 40cm and 40 to 60C). M) 3A soil carbon and nitrogen did not change at different level before soil reclamation, and soil carbon and nitrogen losses mainly occurred in 3~10a..
【作者单位】：四川农业大学资源学院;
【基金】：国家科技支撑计划项目(2015BAC05B01,2015BAC05B02) 四川省科技支撑计划项目(2014SZ0057)
【分类号】：S812.2

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