摘要
研究了我国北方地区主要轮作制度下 ,土壤 植物生态系统中硫的主要输入 (归还 )与输出 (攫取 )途径 .结果表明 ,在我国北方普遍推行的小麦 玉米轮作制中 ,作物收获物从土壤中攫取的硫素总量为每年2 6 .4kg·hm-2 ,由根系和植物其它残留物归还给土壤的硫素为每年 6 .8kg·hm-2 ;在小麦 大豆轮作制中 ,作物收获物从土壤中攫取的硫素总量为每年 2 4 .4kg·hm-2 ,对土壤的归还量为每年 7.2kg·hm-2 ;而在玉米 油菜轮作制中 ,收获物从土壤中攫取的硫量为每年 4 5 .4kg·hm-2 ,归还给土壤的硫量为每年 8.7kg·hm-2 ;其它作物如棉花、高粱、花生、水稻种植一季通过收获物从土壤中带走的硫量分别为每年 7.9、6 .4、6 .7和 18.9kg·hm-2 ,对土壤的归还量分别为每年 2 .6、1.8、4 .3和 5 .6kg·hm-2 .通过对系统主要输入输出通量的估算 ,几种主要农田生态系统硫盈亏的状况计算结果说明 ,供试作物皆存在硫亏缺状况 :小麦每年 6kg·hm-2 、玉米 8.5kg·hm-2 、油菜 2 4kg·hm-2 、水稻 7.1kg·hm-2 .
This paper mainly dealt with the pathways of sulfur (S) input and output in agro ecosystems under general cropping rotations in northern China. The results indicated that in a typical corn wheat rotation system,S output by the crop products was 26.4 kg·hm -2 ,and 6.8 kg·hm -2 of S was returned to the soil through root and plant residues. Under wheat soybean rotation,24.4 kg·hm -2 of S was removed from and 7.2 kg·hm -2 of S were returned to the soil. Under the rotation of corn with rape,up to 45.4 kg·hm 2 was taken out from and only 8.7 kg·hm -2 returned to the soil,respectively. 7.9,6.4,6.7 and 18.9 kg·hm -2 of S output by products and 2.6, 1.8, 4.3 and 5.6 kg·hm -2 of S input by residues were obtained in cotton,sorghum,peanuts and paddy rice,respectively. Through estimation of S balance for these systems,6,8.5,24 and 7.1 kg·hm -2 ·yr -1 of S was lost from soil by growing wheat,corn,rape and paddy rice,respectively.
出处
《应用生态学报》
CAS
CSCD
2003年第6期935-940,共6页
Chinese Journal of Applied Ecology
基金
国家自然科学基金资助项目 (3 9870 13 4)
关键词
硫
生态系统
输入/输出
农业
轮作制度
Sulfur, Ecosystem, Input, Output, Agriculture, Cropping rotation
