集约经营雷竹林土壤质量的演变——以氮磷养分变化为例

Changing of Soil Quality for Extensive Management in Phyllostachy Praecox Forest——Taking NP Nutrient as Example

定位调查宁波奉化集约栽培的雷竹林土壤质量指标,结果表明:氮、磷养分在不同覆盖方式下,其全量养分、速效养分存在差异。林地全氮含量的变化范围是5.86～8.96g/kg,随着栽培年限的延长,土壤全氮含量呈现下降趋势,水解氮含量的变化范围是16.9～30.4mg/kg,全磷含量的变动范围是0.98～1.24g/kg,速效磷含量范围是12.45～29.60mg/kg。从全量养分数值来看,覆盖栽培后土壤全氮、全磷含量呈现增加趋势,速效氮、速效磷养分含量在覆盖4年、6年后增加最为显著,而覆盖10年后速效氮、速效磷含量反而比未覆盖林地下降。因此,从土壤肥力质量的氮、磷养分演变趋势看来,覆盖年限不宜超过10年,连续覆盖栽培3次后,应适当控制覆盖频率和次数,以确保土壤肥力的稳定和提高。

Fixed Investigation was carried out soil quality for extensive management in Phyllostachy Praecox Forest in Fenghua, Ningbo City. The result showed that it had different for N/P nutrient in different cover, especially for total nutrient and quick-acting fertilizer. The changing range of total N content was 5.86 -8.96g/ kg, it prolonged with cultivation year, the total N content of soil was in reducing trend, the changing range of hydrolysis N content was 16.9 - 30.4 mg/kg, the Total P content was 0.98 - 1.24 g/kg, the quick-acting P content was 12.45- 29.60mg/kg, from the value of total nutrient, after the mulching cultivation, the total N and P contents were in increasing trend, the quick -acting N and P nutrients were remarble increased after mulching 4 and 6 years, after 10years mulching, the quick-acting N and P contents were reducing then not mulching forest. So, from the changing of N and P nutrient for soil fertility, the number of mulching year can not over 10 years, after 3 times mulching cultivation, for stable and increase the soil fertility, the mulching frequency and time should be controlled.