种植密度对东北玉米农田土壤呼吸时空动态的影响

生态学杂志

种植密度对东北玉米农田土壤呼吸时空动态的影响

吕国红¹,温日红¹,赵秋石²,李荣平^1**,谢艳兵¹

(¹中国气象局沈阳大气环境研究所，沈阳 110166； ²辽宁省气象局公共服务中心，沈阳 110166)

出版日期:2014-02-10 发布日期:2014-02-10

Effect of planting density on temporal and spatial dynamics of soil respiration of rainfed maize field in Northeast China.

LU Guo-hong¹, WEN Ri-hong¹, ZHAO Qiu-shi², LI Rong-ping^1**, XIE Yan-bing¹

(¹Shenyang Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China; ²Special Meteorological Service Center, Liaoning Meteorological Administration, Shenyang 110166, China)

Online:2014-02-10 Published:2014-02-10

摘要/Abstract

摘要： 基于东北地区玉米生态系统土壤呼吸的观测数据，阐明了玉米常规密度种植和低密度种植土壤呼吸的日变化特征及其空间差异性，分析了温湿度对土壤呼吸的影响。结果表明：土壤呼吸日动态呈单峰型曲线，土壤呼吸日动态最大峰值出现的时间随测定位置不同而变化；玉米常规密度种植土壤呼吸速率最大峰值出现在12:00—15:00；低密度种植土壤呼吸速率最大峰值出现在11:00—16:00；在生态系统尺度上，测定位置距离玉米植株越远，土壤呼吸速率则越低；玉米常规密度种植土壤呼吸速率高于玉米低密度种植；测定位置不同，土壤呼吸速率与土壤温度、空气相对湿度的相关系数不同，均达到显著相关(P<0.01)，其中土壤呼吸速率与土壤温度呈正相关，与近地表的空气相对湿度呈负相关。

关键词: 自生固氮菌, 叶际, 联合固氮菌, 土壤

Abstract: The temporal and spatial dynamics of soil respiration were studied in maize fields with normal and low planting densities in Northeast China and the effects of soil temperature and air relative humidity on the soil respiration rate were analyzed. Results indicated that the diurnal variation of soil respiration showed a single-peak curve. However, the maximum peak appeared at 12:00-15:00 for maize normal planting density and 11:00-16:00 for maize low planting density. Soil respiration had lower rates in positions which were far from maize plants at the ecosystem level. Overall, soil respiration showed higher rates at maize normal planting density than at maize low planting density. The correlation coefficients between soil respiration and temperature or air relative humidity were different among different measuring positions and these correlation coefficients reached a significant level (P<0.01). Soil respiration was positively correlated with the soil temperature and negetively with air relative humidity.

Key words: free-living nitrogen-fixing bacteria, soil, associate nitrogen-fixing bacteria, phyllosphere.

吕国红1,温日红1,赵秋石2,李荣平1**,谢艳兵1. 种植密度对东北玉米农田土壤呼吸时空动态的影响[J]. 生态学杂志.

LU Guo-hong1, WEN Ri-hong1, ZHAO Qiu-shi2, LI Rong-ping1**, XIE Yan-bing1. Effect of planting density on temporal and spatial dynamics of soil respiration of rainfed maize field in Northeast China.[J]. cje.

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