本文選題：不同林分 + 土壤團聚體��； 參考：《北京林業(yè)大學學報》2016年05期

【摘要】：基于野外調(diào)查和室內(nèi)分析,對人工杉木林、馬尾松林、桉樹林、毛竹林、天然林5種不同林分下0~20 cm、20~40 cm土層土壤水穩(wěn)性團聚體穩(wěn)定性及各粒級土壤團聚體有機碳分布特征進行研究。結果表明:1)0~20 cm土層,土壤水穩(wěn)性團聚體質(zhì)量百分含量隨粒級的減小先下降后上升,主要以0.5~0.25 mm粒級最低;5種林分條件下各土層均以0.25 mm的大團聚體為主,隨土層加深,大團聚體含量減少。2)各林分土壤平均質(zhì)量直徑(MWD)和幾何平均直徑(GMD)值變化趨勢相似,均呈現(xiàn)為0~20 cm土層大于20~40 cm土層;林分間土壤MWD、GMD值則表現(xiàn)為天然林最大,桉樹林最小;分形維數(shù)(D)在2個土層均以桉樹最大,杉木林最小;3)5種林分各粒級團聚體中有機碳的含量均隨土層的加深而減少;0~20 cm土層,各林分有機碳含量隨著團聚體粒級減小呈現(xiàn)先增大后減小再增大的趨勢,最大值主要出現(xiàn)在5~2 mm粒級,而有機碳貢獻率則表現(xiàn)為先減小后增大的趨勢。不同林分MWD、GMD差異分析結果表明,天然林土壤結構優(yōu)于其他4種人工林,團聚體穩(wěn)定性更高,而桉樹林最低。隨著土層深度變大,土壤水穩(wěn)性團聚體穩(wěn)定性下降;土壤團聚體有機碳含量表現(xiàn)為天然林最大、桉樹林最小。
[Abstract]:Based on field investigation and indoor analysis, artificial Chinese fir forest, Masson pine forest, eucalyptus forest, Phyllostachys pubescens forest were studied. The stability of soil water stable aggregates and the distribution characteristics of organic carbon in soil aggregates of 0 ~ 20 cm ~ 20 ~ 40 cm soil layer under 5 different stands of natural forest were studied. The results showed that the mass percent content of soil water stable aggregates decreased first and then increased with the decrease of grain size, and the main soil layers were 0.25 mm large aggregates under the condition of 0.5 ~ 0.25 mm lowest grain grade and 5 species stands, and with the deepening of soil layer, the content of soil water stable aggregates decreased firstly and then increased with the decrease of grain size, the results showed that the mass percent content of soil water stable aggregates decreased firstly and then increased with the decrease of grain size. The variation trend of soil mean mass diameter (MWD) and geometric mean diameter (GMDD) of each stand were similar, which showed that the soil layer of 0 ~ 20 cm was larger than 20 ~ 40 cm soil layer, while the GMD value of soil MWDN was the largest in natural forest and the smallest in eucalyptus forest. The fractal dimension (D) was the largest in eucalyptus in the two soil layers, and the content of organic carbon in the aggregates of each grain grade in the 5 stands of Chinese fir forest decreased with the deepening of soil layer, and the content of organic carbon in 20 cm soil layer decreased with the deepening of soil layer. The content of organic carbon in each stand increased first and then increased with the decrease of aggregate grain size. The maximum value appeared in the grain size of 5 ~ 2 mm, while the contribution rate of organic carbon decreased first and then increased. The results of GMD analysis showed that the soil structure of natural forest was better than that of the other four plantations, and the stability of aggregates was higher than that of eucalyptus, while that of eucalyptus was the lowest. With the increase of soil depth, the stability of soil water stable aggregates decreased, and the organic carbon content of soil aggregates was the largest in natural forests and the smallest in eucalyptus forests.
【作者單位】： 北京林業(yè)大學水土保持學院水土保持與荒漠化防治教育部重點實驗室;
【基金】：廣西水利廳“廣西水土保持效應指標體系與生態(tài)補償標準研究”課題(201401005-01-B)
【分類號】：S714.2

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