【摘要】：以川中丘陵區(qū)德陽市旌陽區(qū)37年生柏木人工低效林為研究對象,采用不同開窗補闊面積(50、100、150、200m~2)的改造方式,研究該林地土壤養(yǎng)分和酶活性初期變化規(guī)律.結果表明:與對照林分相比,開窗補闊之后0-5 cm土層p H值、全磷和速效磷含量均有升高,開窗補闊面積150 m~2時土壤多酚氧化酶和脲酶活性較對照林有顯著提高(P0.05),但同土層全碳含量和碳氮比隨開窗補闊面積增大而減少,全氮含量和堿性磷酸酶活性則呈先減少后升高的折線趨勢;開窗補闊面積為100 m~2時在5-20 cm土壤中各全量養(yǎng)分在各處理間處于較高水平,β-葡萄糖苷酶/全碳、堿性磷酸酶/全碳、脲酶/全碳和土壤酶/全氮在開窗補闊面積為50 m~2樣地的5-20 cm土壤較對照林均有顯著升高(P0.05);土壤全碳、全氮與土壤酶關系密切;各種養(yǎng)分和酶活性的盈缺關系揭示了開窗補闊改造的重要性.綜合來看,開窗補闊面積為100 m~2對土壤養(yǎng)分和土壤酶活性影響效果最佳.
[Abstract]:Using artificial low-efficiency forest of 37 years old cypress tree in Jingyang district of central Sichuan hilly area as the research object, the initial changes of soil nutrient and enzyme activity in this forest land were studied by using different renovation methods of open window and wide area (50100150200m~2). The results showed that, compared with the control stand, the pH value, total phosphorus and available phosphorus content of 0-5 cm soil layer increased after the opening of window and width. The soil polyphenol oxidase and urease activity increased significantly (P0.05), but the total carbon content and C / N ratio of the same soil layer decreased with the increase of wide area. The total nitrogen content and alkaline phosphatase activity decreased first and then increased. The total nutrients in the soil from 5 to 20 cm were at a high level, 尾 -glucosidase / total carbon, alkaline phosphatase / total carbon, 尾 -glucosidase / total carbon, and alkaline phosphatase / total carbon. Urease / total carbon and soil enzyme / total nitrogen were significantly higher in 5-20 cm soil than in the control forest (P0.05). Soil total carbon and nitrogen are closely related to soil enzymes, and the surplus and deficiency relationships of all kinds of nutrients and enzyme activities reveal the importance of opening windows to fill the width of the soil. In general, the effect of 100 mm2 on soil nutrient and soil enzyme activity was the best.
【作者單位】： 四川農(nóng)業(yè)大學林學院;四川省農(nóng)業(yè)科學院;四川省林業(yè)工作站;重慶工貿(mào)職業(yè)技術學院;
【基金】：國家“十二五”科技支撐計劃項目(2011BAC09B05) 德國政府貸款四川林業(yè)可持續(xù)經(jīng)營項目(G1403083)資助~~
【分類號】：S714
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本文編號：2350734