浙江省主要土壤含氯背景值和施用含氯化肥对土壤CI~-积累的影响

Soil bsckground chloring content in Zhejiang Province and the effect of chloride fertilizer application on solichlorine aecumultion:

本研究通过对浙江省除滨海盐土外的主要土壤的含氯背景值测定和不同土壤、不同作物的田间施用含氯化肥试验，结果表明，浅海沉积母质的淡涂泥和淡涂田含氯背景值高，但变化范围较大，为７１８．９一６０．４ｍｇ／ｋｇ；其它母质的土壤含氯背景值较低，多在１００ｍｇ／ｋｇ以下。施用合氯化肥会引起土壤Ｃ１－积累，但残留牢固土质而异，变幅为０～３０％，质地较轻、渗排水良好的土壤，Ｃ１－残留率较低，反之则较高，但一般在１０％以下。非灌溉的果园土壤Ｃ１－留率不一定高于水田。连续施用含氯化肥２～３年，土壤Ｃ１－浓度未超过作物的Ｃ１－临界浓度。

The investigation ofsoil background chlorine content in Thejiang Province and field tuals toestimate the chlorine accumulation in soils applied with chloride fertiyizers were carried out from 1 987 to1 990. The rcsults sbowed that the desalting muddy polder soils and paddy flelds on desalting muddy pold-er which devcloped froin shallow sea deposit contained the highest chloruie background content amongmajor soils in Zhejiang Provinee apart from coastal saline soils. But the varianee was large and the rangewas from 60.4 to 7 1 8.gmg / kg. The other soils containcd lower chlonnc background content and most ofthem were below 1 00mg / kg. The applicauon of chloride fertilizero may cause chloruie acccumulation insoils, But the chlorme residue rates (percent oftatol applieil choruie) vatied from 0 to 30.% accord-ing to the soil drainage/ percolation characteristics.If the drainage and pereolation charaberistics weregood. the residue rate was lower; othcrwiso. the residuc rate was higher. But usually the rates were be-low 10.% . The chlorine residue rate in nonirrigaled oreberd soil was not deciuvcly higber than irrigatedpaddy soils. The soil chlonne coneentrations were far below the crop critical concentration of chloruie af-ter 2 or 3 years consective application of chloride fertilizers