摘要
以杨树纯林和杨农复合林2种生态系统为研究对象,通过对土壤有机碳、氮、磷、钾等营养元素含量的测定,初步探讨土壤养分的分布特征。结果表明,杨树纯林和杨农复合生态系统中有机碳、全氮和有效磷含量随着土壤深度增加均呈现递减的趋势;有效钾含量在杨树纯林中随土壤深度的增加而降低,在杨农复合系统中表现出先增大后减小的倒"U"型变化趋势。土壤有机碳、氮、有效磷、有效钾含量范围分别为(6.34±0.22)^(16.88±1.07)g/kg,(0.57±0.09)^(1.35±0.17)g/kg,(4.76±0.44)^(13.88±1.01)mg/kg和(52.8±3.99)^(176.1±8.45)mg/kg。由于间作植物的影响,N,P,K和有机碳的含量在杨树纯林和杨农复合生态系统土壤层中表现出了一定的差异。杨农复合生态系统会在一定程度上改良土壤,增加土壤有机碳和养分元素的含量。
The organic carbon and nutrient elements (N, P, K)of different soil depth in poplar and poplar-crop intercrop- ping patterns were studied in the north of Jiangsu Province. The results showed that the contents of soil organic carbon, to- tal nitrogen, available phosphorus were decreased with the depth of soil. The variation trend of available potassium featured with inverted U-shape. The variation range of soil organic carbon, total nitrogen, available phosphorus and available potas- sium were from (6. 34±0. 22) - ( 16. 88±1.07) g/kg, (0. 57±0. 09) - ( 1.35±0. 17) g/kg, (4. 76±0.44) - ( 13.88± 1.01) mg/kg and (52. 8±3.99) -( 176. 1±8.45) mg/kg, respectively. There were differences between the poplar and poplar-crop intercropping patterns in soil organic carbon and nutrient elements under the effects of crops, suggesting the poplar-crop agroforestry ecosystem may improve soil organic carbon and nutrient elements.
出处
《江苏林业科技》
2016年第1期10-14,共5页
Journal of Jiangsu Forestry Science & Technology
基金
江苏省林业三新工程项目"江苏杨树农田林网更新改造技术集成与示范推广"(LYSX[2015]04)
江苏省属公益类科研院所能力提升项目"江苏杨树农田林网更新改造及效益监测评价技术"(BM2015021)
江苏省林业科学研究院青年基金项目"杨树纯林及杨农复合生态系统碳汇功能研究"(JAF-2012-03)
关键词
杨树
复合生态系统
土壤
有机碳
养分
Poplar
Agroforestry ecosystem
Soil
Organic carbon
Nutrient element