混交模式对杉木、红椎混交林生长及土壤养分影响

Effects of Mix Proportions on Growth and Soil Nutrients of Cunninghamia lanceolata and Castanopsis hystrix Mixed Forest

为实现杉木人工林科学高效经营,对9年生不同混交模式(10杉、9杉1椎、8杉2椎、7杉3椎、6杉4椎、5杉5椎)杉木+红椎混交林生长量、凋落物量及土壤养分含量的变化进行了研究。结果表明:混交模式显著影响了杉木的生长量与土壤养分含量,其中7杉3椎混交模式下杉木胸径和树高生长量最大,而5杉5椎混交模式下林分凋落物量及土壤中全氮、有效氮、有效磷和有效钾含量最高。在立地指数16的情况下,杉木林中红椎混交比例宜控制在30%以内,过高的红椎混交比例虽改善了土壤养分状况,但受红椎生长竞争优势的影响,杉木生长受到抑制。

In order to realize scientific and efficient management of Cunninghamia lanceolata plantation,the changes of growth,litter amount and soil nutrient contents of nine-year-old C.lanceolata and Castanopsis hystrix mixed forest with several mix proportions(pure C.lanceolata plantation,9∶1,8∶2,7∶3,6∶4,5∶5 C.lanceolata and C.hystrix)was studied.The results showed that mix proportion significantly influenced the growth and soil nutrient content of C.lanceolata.DBH and growth of C.lanceolata were the highest at mix proportion of 7∶3 C.lanceolata to C.hystrix.The litter amount and the contents of total nitrogen,available nitrogen,available phosphorus and available potassium in the soil was the highest at 5∶5 mix proportion.In the forestland with site index 16,the mix proportion of C.lanceolata to C.hystrix should be controlled within 30%.The growth of C.lanceolata was inhibited by the growth competitive advantage of C.hystrix,although the high mixed ratio of C.hystrix improved the soil nutrient.