湖北江汉平原农田生态系统Mn的循环及平衡分析

农田生态系统中 ,营养元素循环与平衡的研究已经受到许多学者的广泛关注 ,主要集中于Ｎ ,Ｐ ,Ｋ三要素的研究1 ,2 ] 。微量元素养分循环的研究虽有一些报道3 ,4] ,但主要集中于Ｂ和Ｚｎ元素 ,而对Ｍｎ的研究尚未见报道。微量元素Ｍｎ具有植物营养和污染危害双重作用。在我国 ,Ｍｎ肥的应用研究 ,包括肥效、施肥技术、丰缺诊断等已取得较大进展 ,Ｍｎ对环境污染及危害影响研究也取得了一些成果。随着Ｍｎ肥应用面积日益扩大 ,研究其在土壤 植物系统中循环与平衡 ,以维持Ｍｎ肥对作物适量供应 ,促进农田生态系统Ｍｎ肥的良性循环以及控制土…

Manganese Cycling and Balance in Farmland Ecosystem of Jiang Han Plain in Hubei Province

Eight cropping systems including wheat rice,rice rice,rapeseed soybean,rapeseed peanut,wheat sesame,wheat cotton,pepper cabbage,radish eggplant were conducted to study manganese cycling and balance in farmland ecosystem of Jiang Han Plain in Hubei province. The results show that the main output of manganese was crop harvest,which accounted for 81.3%-95.8% of total,while field runoff and soil leaching of manganese were very little. The main inputs were from organic fertilizer,rainfall and natural return,while inputs from inorganic fertilizer and seeds (seedlings) were very little. The results show that the manganese balance were more positive in two patterns of rice and commercial vegetable ecosystems,and negative in upland field ecosystem without organic fertilizer input.