有机碳土壤改良剂对风沙土改土效应的影响

目的]合成有机碳土壤改良剂,为河西内陆灌区制种玉米产业可持续发展提供技术支撑。方法]选择甘肃省张掖市甘州区的风沙土,采用田间试验方法,进行有机碳土壤改良剂对风沙土改土效应研究。结果]有机碳土壤改良剂施用量与风沙土孔隙度、团聚体、持水量、有机质、速效养分、微生物数量、酶活性和玉米产量呈正相关关系;与体积质量、pH值呈负相关关系。施用有机碳土壤改良剂与传统化肥比较,风沙土体积质量、pH值、Hg,Cd,Cr和Pb分别降低8.46%,4.87%,17.95%,27.78%,15.75%和18.03%;总孔隙度、团聚体、持水量、有机质、碱解氮、速效磷和速效钾分别增加8.15%,23.98%,8.15%,3.16%,0.10%,2.13%和1.18%;真菌、细菌、放线菌、蔗糖酶、脲酶、磷酸酶和玉米施肥利润分别增加59.18%,41.75%,23.28%,57.09%,13.54%,10.71%和2 180.40元/hm2。结论]施用有机碳土壤改良剂,能有效地改善风沙土理化性质和生物学性质,提高玉米产量。

Effect of Organic Carbon Soil Amendment on Sandy Soil Improvement

Objective] Organic carbon soil amendment was compounded to provide technical support for sustainable development of maize industry in Hexi irrigation area.Methods] The study was conducted on the effect of organic carbon soil amendment on sandy soil in Ganzhou district, Zhangye City, Gansu Province through field experiment.Results] The amount of soil organic carbon amendment was positively correlated with indices of porosity, aggregate, water holding capacity, organic matter, available nutrients, microbial biomass, enzyme activity and maize yield, while was negatively correlated with volume weight and pH value. After organic carbon amendment was applied, soil volume weight, pH value, Hg, Cd, Cr and Pb, were all decreased by 8.46%, 4.87%, 17.95%, 27.78%, 15.75% and 18.03% as compared with the effects of conventional fertilizer; indices of total porosity, aggregate, water holding capacity, organic matter, alkali-hydro nitrogen, available phosphorus and available potassium respectively increased by 8.15%, 23.98%, 8.15%, 3.16%, 0.10%, 2.13% and 1.18%; fungi, bacteria, actinomyces, sucrase, urease, phosphatase and corn fertilizing profits increased by 59.18%, 41.75%, 23.28%, 59.18%, 13.54%, 10.71% and 2, 180.40 yuan/hm², respectively.Conclusion] The sandy soil physical and chemical properties and biological properties can be effectively improved by the application of organic carbon soil amendment, and the maize yield increased as well.