不同耕作处理下冻融对农田黑土硬度的影响  

Impacts of Freezing-Thawing Cycle on Soil Penetration Resistance Under Different Tillage Practices in Black Soil

作　　者：陈学文[1] 王农 刘亚军 张晓平[1] 梁爱珍[1] 贾淑霞[1] 时秀焕[1,4] 范如芹[1,4] 

机构地区：[1]中国科学院东北地理与农业生态研究所,吉林长春130102 [2]吉林省国土规划研究室,吉林长春130051 [3]梨树县农业技术推广总站,吉林梨树136500 [4]中国科学院大学,北京100049

出　　处：《水土保持通报》2012年第6期55-60,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"保护性耕作下农田黑土紧实度对碳固定的影响"(41201217);国家自然科学基金项目"保护性耕作下黑土团聚体在土壤固碳过程中的物理作用研究"(31170483);国家自然科学基金项目"土壤微生物在保护性耕作黑土有机碳固定中的作用"(41101241)

摘　　要：为探讨冻融作用对农田黑土硬度的影响,在吉林省德惠市中层黑土小区上进行了9a的田间定位试验,对不同耕作方式下冻融前后的土壤硬度以及土壤硬度与土壤含水量之间的关系进行了对比分析。结果表明,土壤硬度与土壤水分呈对数显著性负相关关系(R2=0.838 8)。冻融前免耕较秋翻显著增加了土壤硬度(p<0.05),主要表现在2.5-17.5cm深度之间。冻融后免耕较秋翻降低了2.5-17.5cm的土壤硬度,并且在2.5-10cm达到差异显著性水平(p<0.05)。冻融后土壤硬度明显低于冻融前,冻融前后两种处理下玉米连作的土壤硬度均高于玉米-大豆轮作,但最大土壤硬度均对作物的生长没有限制作用。The effects of freezing—thawing cycle on soil penetration resistance were studied on a black soil in Northeast China.The tillage experiment was established in Dehui City,Jilin Province since 2001.We compared soil penetration resistance before and after the freezing—thawing cycle under both no tillage（NT） and mouldboard plow（MP） treatments.Furthermore,we analyzed the relationship between soil penetration resistance and soil moisture content.The results showed that there was a significantly negative logarithmical correlation between soil penetration resistance and soil moisture content（R2=0.838 8）.Compared with MP treatment,NT led to a significant increase of soil penetration resistance before the freezing—thawing cycle,especially in the layer of 2.5—17.5 cm（p0.05）,while resulted in reduction of soil penetration resistance of 2.5—17.5 cm after the freezing—thawing cycle,especially in the layer of 2.5—10 cm（p0.05）.Soil penetration resistance was obviously less after the freezing—thawing cycle than before（p0.05）.Soil penetration resistance was greater under continuous corn system than under corn—soybean rotation system.How-ever,even with the maximum soil penetration resistance,no restriction was found on the crop growth before and after freezing—thawing cycle of both NT and MP.

关 键 词：冻融 土壤硬度 土壤含水量 犁底层 黑土 

分 类 号：S152[农业科学—土壤学]