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结合野外调查与室内分析,对峡谷型喀斯特水田(ST)、旱地(HD)、草地(CD)、灌丛(GC)、人工林(RGL)、次生林(CSL)6类生态系统进行研究,探讨不同生态系统土壤养分及其生态化学计量特征。结果表明:(1)除全钾含量外,6类生态系统土壤养分含量均随土层增加而减少,土壤pH与之相反;(2)与全球不同生态系统土壤的平均水平相比,峡谷型喀斯特不同生态系统的碳氮比、碳磷比、碳钾比、磷钾比和氮磷比均较低;(3)不同生态系统土壤养分含量差异显著,不同生态系统的化学计量差异也显著,土壤肥力的总体趋势为次生林>人工林>水田>旱地>灌丛>草地。不同发展阶段、不同生态系统土壤养分的限制因子不同,应制定不同的管理和施肥措施,促进峡谷型喀斯特乃至整个西南喀斯特区域植被的迅速恢复和生态重建。
Based on the field investigation and field analysis, this paper studied on 6 types of ecosystem of canyon type paddy field (ST), dryland (HD), meadow (CD), shrub (GC), plantation (RGL) and secondary forest Soil Nutrients and Their Ecological Stoichiometry in Different Ecosystems. The results showed that: (1) In addition to the total potassium content, the soil nutrient contents of six ecosystems decreased with the increase of soil layers, but the pH of the soil was the opposite. (2) Compared with the average level of soils in different ecosystems, The ratios of carbon to nitrogen, carbon to phosphorus ratio, carbon to potassium ratio, phosphorus to potassium ratio and nitrogen to phosphorus ratio of karst ecosystem were lower. (3) The content of soil nutrients in different ecosystems was significantly different, and the differences in stoichiometry of different ecosystems were also significant. The overall trend of soil fertility is secondary forest> plantation> paddy field> dry land> shrub> grassland. In different stages of development, the limiting factors of soil nutrients in different ecosystems are different, and different management and fertilization measures should be formulated to promote the rapid recovery and ecological reconstruction of the vegetation in the gorge karst and even the entire Southwest Karst region.