不同海拔蔗区土壤有机质、全氮含量和pH值特征

Soil Organic Matter,Total Nitrogen and p H in Sugarcane Farmlands at Different Altitudes

为明确海拔高度对云南省山地甘蔗土壤有机质、全氮及p H的变化影响,研究了云南省甘蔗种植面积最大的地级市——临沧市甘蔗生产区1 740份土壤样品的有机质、全氮含量和p H值的差异。结果表明:土壤有机质和海拔呈极显著相关关系(γ=0.156**,p<0.01),随海拔升高而增加;土壤全氮含量、p H值与海拔无显著相关关系,不随海拔升高而增加。临沧市蔗地土壤有机质含量平均为25.6 g·kg^(-1),变幅为0.3 g·kg^(-1)~79.1 g·kg^(-1),变异系数为41%;土壤全氮平均含量为0.120 g·kg^(-1),变幅0.117 g·kg^(-1)~0.122 g·kg^(-1),变异系数为44%;土壤p H值平均5.3,变幅3.6~8.6,变异系数15%。

Aimed at understanding the effect of altitude on soil organic matter,total nitrogen and p H in sugarcane farmlands,we collected 1 740 soil samples from Lincang City,the largest sugarcane planting area in Yunnan Province,and analyzed relevant parameters. The result showed that soil organic matter was significantly correlated with altitude（ γ = 0. 156＊＊,p 0. 01）,which increased with altitude elevation,while total soil nitrogen and p H were not correlated with altitude. Average content of soil organic matter was25. 6 g·kg^-1,ranging from 0. 3 to 79. 1 g·kg^-1 with 41% of CV; average content of total nitrogen was 0. 120 g·kg^-1,ranging from0. 117 to 0. 122 g·kg^-1 with 44% of CV; average pH was 5. 3,ranging from 3. 6 to 8. 6 with 15 % of CV.