摘要
在棉田生态系统Ｎ循环中，低、中、高、超高产棉田Ｎ素的输入与输出不平衡，亏盈值（Ｂｋ）分别为－９．８，－１０．６，－１３．５和－１６．２ｋｇ／ｈｍ２，平衡值（Ｂ１）为０．９１１３，０．９４３５，０．９４２９，０．９４５８。每种１季棉花，土壤库现存Ｎ减少２‰～６‰。低、中、高、超高产棉田产物Ｎ输出，分别为棉田生态系统总输出Ｎ的５４．４％，４６．５％，４４．９％和４３．４％，其中经济产品（棉子和纤维）Ｎ，均占产物Ｎ输出的７０％左右。在非经济产品中，铃壳含Ｎ较多，若将８０％的铃壳还田，则能大体保持棉田生态系统Ｎ素的平衡。
The estimated input and output of nitrogen illustrated that Ncycling was not balance in cotton field ecosystem.The output of nitrogen was more than the input.The balance values of incomeloss of nitrogen (Bk) were -98,-106,-135 and -162,in the low yield powder field(LYPF),in the middle(MYPF),in the high(HYPF)and in the euper high(SHYPF),respectively.The apparent balance of input/output(B1)were 09113、09435、09429 and 09458 in LYPF,MYPF,HYPF and SHYPF,respectively.The Nexported cotton products in the overall Noutput from the ecosystem were 544%、465%、449% and 434% for LYPF、MYPF、HYPF and SHYPF,respectively.Nitrogen of cotton fiber and seed in the Nexported cotton products was about 70% in four kinds of fields.Cotton bur contained more nitrogen than other cotton parts except cotton leaf and seed.If 80% cotton burs returned to the cotton field,Ncycling in the cotton field ecosystems could keep balance of Ninput and Noutput.
出处
《生态学报》
CAS
CSCD
北大核心
1998年第4期348-352,共5页
Acta Ecologica Sinica
关键词
氮循环
棉田
生态系统
nitrogen,cycling,cotton fields,ecosystems.
