深圳市南山区主要道路绿地土壤质量调查与评价

Soil quality investigation and evaluation of main road greenbelts in Nanshan District of Shenzhen

在对深圳市南山区主要道路绿地土壤调查的基础上,采用土壤单项肥力指标评价法和改进的内梅罗土壤综合肥力评价法对道路绿地0~20 cm和20~40 cm土壤进行评价,结果表明:(1)绿地土壤pH以碱性为主,两种深度土壤分别为45%和55%;(2)土壤电导率(EC值)主要分布在0.02~0.86 mS·cm^(-1)和0.02~0.13 mS·cm^(-1);(3)土壤有机质分别为17.44 g·kg^(-1)和14.70 g·kg^(-1),中等以下含量占比分别为60%和80%;(4)土壤碱解氮含量平均值分别为63.40 mg·kg^(-1)和51.06 mg·kg^(-1);(5)两种深度土壤速效钾含量主要处于稍缺的中下水平(50~100 mg·kg^(-1))和中等水平(100~150 mg·kg^(-1)),0~20 cm土层两种水平占比分别为35%、20%,20~40 cm土层两种水平占比分别为40%、20%,两种深度土壤的平均值分别为129.85 mg·kg^(-1)和126.77 mg·kg^(-1);(6)两种深度土壤有效磷含量主要处于4级、5级水平(5.00~10.00 mg·kg^(-1)和3.00~5.00 mg·kg^(-1)),但其平均值分别达到14.71 mg·kg^(-1)和9.87 mg·kg^(-1);(7)土壤综合肥力指数分别为1.13和0.87,分别处于一般和贫瘠状态。为进一步提高南山区道路绿地的保护和可持续利用,应根据绿地土壤质量评价,针对性地对南山区道路绿地酸碱度、养分、物理结构进行改良,提高道路绿地土壤肥力水平和改善物理结构。

Based on the soil investigation of the main road green areas in Nanshan District of Shenzhen,the soil single fertility index method and the improved Nemeiro soil comprehensive fertility index method was used to evaluate the road green area 0~20 cm and 20~40 cm soil.The result showed:(1)the green soil pH were mainly alkaline,the two depths of soil were 45%and 55%respectively.(2)The electrical conductivity(EC value)was mainly distributed in 0.02~0.86 mS·cm^(-1) and 0.02~0.13 mS·cm^(-1).(3)The organic matter were 17.44 g·kg^(-1) and 14.70 g·kg^(-1),the proportions of content below the medium level were 60%and 80%.(4)The average available nitrogen were 63.40 mg·kg^(-1) and 51.06 mg·kg^(-1),respectively.(5)The two depths of soil were at a slightly lacking middle and lower level(50~100 mg·kg^(-1))and medium level(100~150 mg·kg^(-1)).The proportions of the 0~20cm soil layer were 35%and 20%respectively.The proportions of the two levels of 20~40 cm soil layer were 40%and 20%respectively.The average available potassium were 129.85 mg·kg^(-1) and 126.77 mg·kg^(-1),respectively.(6)The average values of available phosphorus were 14.71 mg·kg^(-1) and 9.87 mg·kg^(-1),respectively,mainly at level 4 and level 5(5.00~10.00 mg·kg^(-1) and 3.00~5.00 mg·kg^(-1)).(7)The improved Nemeiro soil comprehensive fertility index was 1.13 and 0.87,respectively,in a normal and barren state respectively.For further improve the protection and sustainable use of road green space in Nanshan District,the pH,nutrients and physical structure of road green space in Nanshan District should be improved according to the evaluation of green soil quality,achieve improve the soil fertility level and physical structure of road green space.