摘要
基于2005~2015年东北旱作区85县市的粮食单产数据和土壤属性数据,探讨了东北旱作区粮食单产冷热点时空格局演变特征,并分析了不同冷热点区耕层特征的差异。结果表明:(1)2005,2010和2015年东北旱作区粮食单产全局Moran's/值分别为0.57,0.41、0.65,呈现明显空间集聚特征。吉林省旱作区中部、黑龙江省旱作区南部县市是稳定的粮食单产热点区;而各级冷点区在吉林省旱作区西部和黑龙江省旱作区北部、西南部集中连片分布。(2)粮食单产一、二级热点区土壤容重在10~20 cm土层最高,分别为1.51 gcm=1.53 gcm3呈现亚表层较高的特点。粮食单产一级冷点区各土层深度有机质含量均大于其他类型区;而二级热点区各土层深度有机质含量均小于其他类型区。(3)东北旱作区56.00%的样点耕层厚度在15~25 cm之间,53.03%的样点压实层厚度在5~10 cm之间。一级热点区耕层厚度在15-25 cm和压实层厚度在5~10 cm的样点各占该类型区样点数的81.82%和68.18%,呈现“耕层较厚、压实层厚度适中、穿透阻力相对较小”的特点。
Based on the data of grain yield and soil properties in 85 counties of the dry farming region of Northeast China from 2005 to 2015,the temporal and spatial characteristics of the coldspots and hotspots of grain yield in the dry farming region were discussed,and the differences of soil characteristics in plough horizons were analyzed.The results showed that:(1)The global Moran's value of grain yield in 2005,2010 and 2015 was 0.57,0.41 and 0.65,respectively.This indicated that there was an obvious spatial agglomeration.The central counties of the dry farming regions in Jilin Province and the southern counties and cities of the dry farming areas in Heilongjiang Province were the stable hotspots of grain yields.The coldspots at all levels were concentrated and distributed contiguously in the west dry farming regions of Jilin Province and in the north and south dry farming regions of Heilongjiang Province.(2)The soil bulk density at the first-and second-level hotspots of grain yields was the highest of 1.51 g cm-3 and 1.53 g cm-3 at 10-20 cm,respectively.The organic matter content at each soil layer was the highest in the first level coldspots and was the smallest in the second-level hotspot of grain yield.(3)The thickness of the plough horizon of 56.00%sampling points was 15-25 cm,and the thickness of the compacted layer of 53.03%sampling points was 5一10 cm in the northeast dry farming region.In the first-level hotspots,there was 81.82%and 68.18%of the sample points with 15-25 cm plough horizon and 5-10 cm compacted layer,which showed the characteristics of thick plough horizon,moderate compacted layer and relatively lower penetration resistance.
作者
卓志清
兴安
孙忠祥
黄元仿
曹梦
李勇
ZHUO Zhi-qing;XING An;SUN Zhong-xiang;HUANG Yuan-fang;CAO Meng;LI Yong(College of Resources and Environment,China Agricultural University,Beijing 100193,China;Key Laboratory of Agricultural Land Quality,Ministry of Natural Resources,Beijing 100193,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2019年第4期904-912,共9页
Chinese Journal of Soil Science
基金
国家重点研发计划项目(2016YFD0300801)
国家自然科学基金项目(41571217)资助
关键词
旱作区
粮食单产
冷热点分析
耕层
压实层
Dry farming region
Grain yield
Hot Spot analysis
Plough horizon
Compacted layer
