Effects of Planting Structure Changes on Soil Nutrients in Developed Coastal Region

The study of effects of planting structure changes on soil nutrients was important significance in both theory and practice.In the case of four towns of Shouguang in Shandong province,the research results indicated that,the planting structure have been considerably changed in this region from 1980 to 2004, and the soil nutrient contents significantly increased at the same times.The average value of soil organic matter content was increased by 26.3%.The contents of alkali-released nitrogen,available phosphorus and available potassium were increased by 28.77%,755.04% and 194.35%,respectively.The contents of available Fe,Zn,Cu,Mn,Mo and B in soils were also significantly increased by 191.77%,487.77%,47.90%,22.83%,97.23% and 76.80%,respectively.The ranges of soil nutrient increase were different in three different planting types.The order for the increase of soil organic matter was vegetable soilgrain crop soilorchard soil.The order for the increase of alkali-release N,available P,K,Zn and Mn was vegetable soil orchard soil grain crop soil.The order for the increase of available Fe and Cu was orchard soilgrain crop soil vegetable soil.The order for the increase of available Mo and B was grain crop soil vegetable soil orchard soil.The increase of amount of fertilizer application was the main reason for the result of soil nutrient increase from the planting structure changes.