The Relationship Between Nitrogen Forms And Corrosion Resistance And The Significance Of Ecological Civilization In Paddy Soil In Jiangxi

The paddy soils in Jiangxi Province had been selected as study object.we determine the sampling point according to the historical data query,farming area,paddy land,paddy soil source type.based on the investigation data of soil and soil physical and chemical properties,using statistical and GIS methods,the distribution characteristics of different nitrogen forms in soil and the comprehensive index of soil erosion resistance and the mechanism of nitrogen loss were analyzed in different paddy soils under the condition of different locations,tillage years and parent materials.To provide a scientific basis for the prevention and control of agricultural non-point source pollution in Jiangxi Province and water pollution.The results showed that:（1）from the Ganjiang River upstream to downstream,the content of total nitrogen,alkali hydrolyzable nitrogen and ammonium nitrogen in paddy soil showed an increasing trend,while nitrate nitrogen showed the opposite pattern.With the increase of tillage years,the content of total nitrogen,alkali hydrolyzable nitrogen and ammonium nitrogen increased gradually,but the nitrate nitrogen showed the opposite trend.The contents of total nitrogen and alkali hydrolyzable nitrogen in the paddy soils with five kinds of parent materials were as follows:lacustrine parent material>fluvial parent material>granite parent material>quaternary red soil parent material>red sandstone parent material.The content of nitrate nitrogen was as follows:red sandstone parent material>fluvial parent material>granite parent material>lacustrine parent material>quaternary red soil parent material.The content of ammonium nitrogen was as follows:lacustrine parent material>quaternary red soil parent material>lacustrine parent material>granite parent material>red sandstone parent material.（2）the best of corrosion resistance evaluation index of paddy soils in Jiangxi Province was as follows:bulk density X₁、>0.25mm water stable aggregates X₆、>0.5mm water stable aggregates X₇、<0.01mm particle content X₃、<0.001mm particle content X₄、pHX₁₁、organic matter X₁₂.The calculation formula of comprehensive corrosion resistance is as follows:Y=0.52425Y₁+0.33396Y₂+0.14178Y₃.（3）Soil anti erodibility of the strength of Jiangxi Province is as follows:the Ganjiang River downstream<the Ganjiang River upstream;more than 100 years>50-100 years>under 50years;lacustrine parent material>fluvial parent material>quaternary red soil parent material>red sandstone parent material>granite parent material.The soil corrosion resistance is good for the total nitrogen,ammonium nitrogen in the paddy soil to maintain and inhibit ammonium nitrogen into nitrate nitrogen.（4）The phenomenon of excessive fertilization of paddy soils in Jiangxi Province is ubiquitous.The implementation of ecological agriculture policy,reducing fertilizer application,adopting water saving irrigation can reduce surface runoff.Application of organic fertilizer and straw returning can reduce soil infiltration.These measures were effective measures to control nitrogen loss in rice field.