通道绿化杨树丰产林建设潜在威胁分析研究

Study on the Potential Threat on Construction of High-Yield Poplar

在杨树速生丰产林的经营过程中存在着人工林地力衰退和林带胁地的问题。笔者从轮作、更换品种、林下间作农作物3个方面对杨树丰产林建设中存在的问题进行了研究。研究表明,杨树多代连作,从第3代开始,生长量明显下降;同一代次条件下更换品种之后对林地土壤肥力有明显影响,林地土壤有机质增加40%～65%,速效N增加77%～155%,速效K增加7%～23%;间作大豆对改善连作林地土壤养分的作用更加明显。

During the process of growth of Channel high-yield poplar plantation, there are many problems, such as soil deg- radation, forest belt affecting crop growth. This paper conducted the researches iricluding three aspects （crop rotation, re- piacement of species,intercropping crops） of the construction of high-yield poplar in the actual production. Research showed that in several generations of continuous cropping poplar since the third generation growth decreased significantly; the re- placement of species affected soil fertility significantly in the same generation. Soil organic matter in the forestland increased by 40% -65% , available nitrogen increased by 70% - 155% , available potassium increased by 7% - 23% ;Soil nutrients were improved significantly in soybean under intercropping.