摘要
采用传统统计和地统计相结合的方法 ,对面积约 470km2 的玉田县粮田耕层土壤养分进行了空间变异特征与分区管理技术研究。结果表明 ,土壤N、P、K、Mn和Zn普遍缺乏 ,不同土壤养分的变异情况各不相同 ;土壤主要养分N、P、K、Mn和Zn含量的最大相关距离分别为 2 7.1、1 9.7、2 7.1、1 4.4和 2 6.4km ,基本趋于以大块状变异为主 ,这一基本趋势对土壤养分分区管理是有利的 ;土壤养分速效含量呈现较明显的空间分布格局 ,对土壤主要养分N、P、K、Mn和Zn可分别分成 2、3、3、3和 2个养分分区 ,因而对这 5个土壤养分进行分区管理可行 ;作物高产优质分区平衡施肥技术在小麦和玉米上使产量分别增加 1 0 .9%～1 3 .1 %和 1 4.3 %～ 2 1 .7% ,使经济效益分别提高 5 90～ 747和 72 4～ 1 3 43RMBYuanhm- 2 。
Summary Spatial variability and regionalized management technology of soil nutrients in a grain crop region with an area of 470 km 2 was studied using geo statistics. The results showed that the grain crop region was widely deficient in N, P, K, Mn and Zn. Variation of the soil nutrients differed remarkably. The maximum correlative distance of major soil N, P, K, Mn and Zn in content was 27.1, 19.7, 27.1, 14.4 and 26.4 km, respectively. It revealed that their variation in content developed in large block scale, which is useful to regionalized management of soil nutrients. There was a notable tendency of soil readily available nutrients in spatial distribution in the grain crop region. The grain crop region could be regionalized into 2 to 3 management units, and each unit consisted of connected fields. The number of management units in the grain crop region were 2 for N, 3 for P, 3 for K, 3 for Mn, 2 for Zn. With regionalized balance fertilization technology on wheat and corn, yield increased by 10.9% to 13.1% and 14.3% to 21.7%, respectively, economic profit by 590 to 747 and 724 to 1343 RMB Yuan hm -2 .
出处
《土壤学报》
CAS
CSCD
北大核心
2003年第1期79-88,共10页
Acta Pedologica Sinica
基金
国家"九五"科技攻关项目 (96-0 0 4-0 1 -1 4-1 )
国家重点基础研究发展规划项目 (G1 9990 1 1 81 1 )资助
