围封对短花针茅植丛土壤颗粒组成和养分富集的影响  

Effects of Enclosure on Soil Particle Composition and Nutrient Enrichment of Stipa breviflora

作　　者：苗翻 杨新国[1,2,3] 古君龙 杨东东[1,2,3] MIAO Fan;YANG Xinguo;GU Junlong;YANG Dongdong(Northwest National Key Laboratory Breeding Base for Land Degradation and Ecological Restoration,Ningxia University,Yinchuan,Ningxia 750021;Key Laboratory of Restoration and Reconstruction of Degraded Ecosystems,Ministry of Education,Ningxia University,Yinchuan,Ningxia 750021;Joint Research Center for Ecology and Biological Resources Development in Western China,Ningxia University,Yinchuan,Ningxia 750021)

机构地区：[1]宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,宁夏银川750021 [2]宁夏大学退化生态系统恢复与重建教育部重点实验室,宁夏银川750021 [3]宁夏大学西部生态与生物资源开发联合研究中心,宁夏银川750021

出　　处：《北方园艺》2019年第9期98-105,共8页Northern Horticulture

基　　金：国家自然科学基金资助项目(31460161);宁夏大学西部一流学科建设资助项目(NXYLXK2017B06);宁夏大学西部一流大学建设资助项目(GZXM2017001)

摘　　要：以一体化土壤采集器为试材,采用植丛内外差值百分比法,以围封退化短花针茅草地为研究对象,临近自由放牧草地为对照(CK),对比研究了荒漠草原短花针茅植丛对土壤颗粒组成和SOC和TN的富集效应在空间上的变化,以期探讨植丛对土壤富集作用的影响。结果表明:就富集率"E"值而言,粘粒(<2μm)和砂粒(50～2 000μm)的富集格局大致趋势相反,生境和土层深度对粉粒(2～500μm)的富集均无显著影响(P>0.05)。SOC在6～8 cm土层放牧区显著高于围封区,12～14 cm土层围封区显著高于放牧区;TN则在4～6 cm土层围封区显著高于放牧区,12～14 cm土层放牧区显著高于围封区(P<0.05)。沿土层深度垂直变化,颗粒组成仅放牧区砂粒在12～14 cm土层"E"值显著增高(P>0.05);SOC围封区0～2 cm土层"E"值显著高于其它土层(P<0.05),TN放牧区呈先减少后增高"V"型变化,4～8 cm土层"E"值显著降低(P<0.05),放牧区的SOC和围封区的TN都无显著变化(P>0.05)。粘粒与砂粒的"E"值均呈显著负相关(P<0.05),粉粒与粘粒、粉粒与砂粒的"E"值相关关系逆转;颗粒组成与SOC、TN的"E"值相关性都不显著(P>0.05)。总之,围封并未使短花针茅植丛对土壤粘粒的整体富集率增大,反而有所降低;但围封确推动了土壤粘粒和SOC表聚型富集;土壤SOC和TN的富集是2个独立的过程,围封都有利于任意土层TN的富集。The integrated soil collector was used as the experimental material,and the percentage difference method inside and outside the plant was adopted.The enclosure of degraded Stipa breviflora was studied,and the free grazing grassland was used as the control.The spatial variation of soil particle composition and SOC and TN enrichment effects in the desert steppe was studied.In order to answer the impact of planting on soil enrichment.The results showed that in terms of the enrichment rate ‘E’ value.The enrichment pattern of clay(<2 μm) and sand(50-2 000 μm) was roughly opposite,and habitat and soil depth have no significant effect on the enrichment of silt(2-500 μm)(P>0.05).SOC in the 6-8 cm soil layer grazing area was significantly higher than the enclosed area(P<0.05),the 12-14 cm soil layer enclosing area was significantly higher than the grazing area(P>0.05);TN was significantly higher in the enclosed area of 4-6 cm soil than in the grazing area(P<0.05),the grazing area of the 12-14 cm soil layer was significantly higher than the enclosed area(P>0.05).Vertical variation along the depth of the soil layer,particle composition only in the grazing area sand ‘E’ value in the 12-14 cm soil layer was significantly increased(P>0.05).The ‘E’ value of the 0-2 cm soil layer in the SOC enclosure was significantly higher than that in other soil layers(P<0.05),the TN grazing area was reduced first and then the ‘V’ type was increased,and the ‘E’ value of the 4-8 cm soil layer is significantly reduced(P<0.05),there was no significant change in the SOC of the grazing area and the TN of the enclosed area(P>0.05).There was a significant negative correlation between the ‘E’ values of caly and sand(P<0.05),and the correlation between the ‘E’ values of the silt and clay,silt and sand was reversed;the composition of the particles and the ‘E’ value of the SOC,TN correlation was not significant(P>0.05).In shortenclosure did not increase the overall enrichment rate of soil clay by the short stalk,but en

关 键 词：短花针茅 围封 颗粒组成 SOC和TN 富集效应 

分 类 号：S155.47[农业科学—土壤学]