摘要
在生物量、生产力和水量平衡及养分分析的基础上，系统研究了黄土残塬沟壑区刺槐人工林生态系统的养分循环过程。结果表明：生态系统中养分元素总贮量为Ｎ１０．９４０ｔ／ｈｍ２，Ｐ３．７５５ｔ／ｈｍ２，Ｋ１５４．６１１ｔ／ｈｍ２，Ｃａ１６９．０９２ｔ／ｈｍ２，Ｍｇ１８．４３５ｔ／ｈｍ２，Ｓ１．４８７ｔ／ｈｍ２；生态系统内养分生物循环遵循Ｃａ＞Ｎ＞Ｋ＞Ｍｇ＞Ｐ＞Ｓ的顺序；刺槐生产１ｔ干物质需要从土壤吸收Ｎ１１．６７ｋｇ，Ｐ０．７２ｋｇ，Ｋ３．６６ｋｇ，Ｃａ１５．０８ｋｇ，Ｍｇ２．２５ｋｇ，Ｓ０．３４ｋｇ；经过循环利用，生态系统年净积累量Ｎ１．８０７３ｋｇ／ｈｍ２，Ｐ０．２１０６ｋｇ／ｈｍ２，Ｋ１．３７５６ｋｇ／ｈｍ２，Ｃａ２．７８８１ｋｇ／ｈｍ２，Ｍｇ０．４４０ｋｇ／ｈｍ２，Ｓ０．０６２１ｋｇ／ｈｍ２，根层土壤却年净亏损Ｎ８９．６９６ｋｇ／ｈｍ２，Ｐ５．４９２ｋｇ／ｈｍ２，Ｋ３４．４７９ｋｇ／ｈｍ２，Ｃａ８８．９９１ｋｇ／ｈｍ２，Ｍｇ１５．２７０ｋｇ／ｈｍ２，Ｓ２．５１１ｋｇ／ｈｍ２。此外，所建立的该生态系统的养分动态模拟模型，可用于对各分室养分贮量动态的预测。
Based on measurement of biomass, prodcutivity, water balance and nutrient content, the nutrient cycle proceses of black locust plantation ecosystem in gullied loess plateau has been studied systematically. The results showed that the total nutrients accumulations were N 10.940, P 3.755, K 154.611,Ca 169.092, Mg 18.435, S 1.487 t/hm2; the nutrient biocycling fluxes were in the order of Ca>N>K>Mg>P>S; the uptakes of nutrients from soil to produce l ton dry material of biomass were about to N 11.67, P 0.72, K 3.66, Ca 15.08, Mg 2.25, S 0.34 kg, the annual net accumulations in the total ecosystem were N 1.8073, P 0.2106, K 1.3756, Ca 2.7881, Mg 0.4400, S 0.0621 kg/hm2, but the annual net shortages in the soil layer distributed concentratively with roots were N 89.696, P 5.492, K34.479, Ca 88.991, Mg 15.270, S 2.511 kg/hm2. In addition, the trend models of nutrient cycling could be used to predict the nutrient storages in every compart of the total ecosystem.
出处
《西北林学院学报》
CSCD
北大核心
1998年第2期34-40,共7页
Journal of Northwest Forestry University
