甘肃省不同区域人工草地土壤肥力特征研究

以甘肃省不同区域人工草地土壤样品为研究对象,测定12个不同区域[民乐县(ML1、ML2)、安定区(AD)、通渭县(TW1、TW2、TW3、TW4)、宁县(NX1、NX2)、靖远县(JY1、JY2、JY3)]人工草地土壤的pH值、有机质、全氮、速效磷、速效氮、速效钾。结果表明:AD的p H值最大,JY3的pH值最小;TW2有机质含量最高,AD有机质含量最低,TW2较AD提高了78.95%,在TW2种植陇东苜蓿对土壤有机质影响大;TW2、TW3速效氮含量较高,约为AD速效氮含量的3倍,在TW2、TW3种植陇东苜蓿对土壤速效氮影响大;JY2速效钾含量是AD的3倍,TW2速效钾的含量最低,在JY2种植陇东苜蓿对速效钾影响大;ML1、ML2速效磷含量较高,NX1、NX2速效磷含量较小,在NX1、NX2种植陇东苜蓿对土壤速效磷影响小;TW2全氮含量最高,较AD提高了85.07%,在TW2种植陇东苜蓿对土壤全氮影响大。综合分析结果显示,TW2土样的关联度值最大(0.787 9),综合肥力最好,为最优土样;NX2土样的关联度最小(0.500 7),综合肥力最差。

The Research of Artificial Grassland Soil Fertility in Different Region of Gansu Province

The soil p H,organic matter,total nitrogen,available phos phorus,available nitrogen available potassium of artificial grassland in 12 different regions of Gansu province [Minle county(ML1,ML2),Anding district(AD),Tongwei county(TW1,TW2,TW3,TW4),Ningxian county(NX1,NX2)and Jingyuan county(JY1,JY2,JY3)]were measured by using soil samples from different regions of Gansu province. The results showed that the p H value of AD was the highest and the p H value of JY3 was the smallest. The organic matter content of TW2 soil samples was the highest,the organic matter content in TW2 soil samples was the lowest,and the organic matter content of TW2 soil was increased by 78.95%.TW2 and TW3 soil samples had the highest effect on soil organic matter. TW2 and TW3 had the highest content of available nitrogen in soil samples,which was about 3 times of the available nitrogen content of AD soil. In TW2 and TW3,the effect of alfalfa on soil available nitrogen was significant. The content of available potassium in JY2 soil samples was the highest content of available potassium in AD2 and TW2 soil samples,and the effect of available matter potassium in JY2 planted Longdong alfalfa was high. The ML1 and ML2 in soil samples were about NX1 and NX2 and the effect of NX1 and NX2 on the soil available phosphorus was higher in NX1 and NX2 plants. The highest TW content in soil samples was 85.07% higher than that in AD,and the effect of TW2 on alfalfa was significant. The results of comprehensive analysis showed that the correlation value of TW2 soil samples was the highest(0.787 9),the best comprehensive fertility was the best soil sample,and the correlation degree of NX2 soil samples was the smallest(0.500 7)and the comprehensive fertility was the worst.