杉木与红锥混交林生长量及混交比例的研究

Study on growth increment and mixed ratio of a mixed forest of Cunninghamia lanceolata and Castanopsis hystrix

对红锥纯林、9杉1锥、8杉2锥、7杉3锥4种红锥造林模式的10年生林分的胸径、树高、蓄积生长量对比分析。结果表明,不同混交比例的林分平均胸径、树高、蓄积间有显著或极显著差异。在相似的郁闭度下,7杉3锥林分蓄积量最大,8杉2锥林分次之,9杉1锥林分再次之,红椎纯林的最低。不同混交比例对土壤肥力有较大影响,随着林分红锥树种数量的增加,林地土壤中的有机质、全N、水溶性N、速效P含量等土壤肥力指标显著提高,7杉3锥是3种混交比例中最佳的。

The afforestation model of pure Castanapsls hystrir A. DC. forest and different mixed ratio forest of Cunninghamia lanceolata （Lamb.） Hook and Castanapsis hystrir was studied by breast diameter and height and volume growth quantity. The results showed there were significant or extremely significant differences of average diameter and height and volume growth quantity between differently mixed ratio forests. Under similar shade density, the stand volume of mixed forest that was composition of 7 Cunninghamia lanceolata and 3 Castanapsis hystrir was the highest, the next was mixed forest of 8 Cunninghamia lanceolata and 2 Castanapsis hystrir, the mixed forest of 9 Cunninghamia lanceolata and 1 Castanapsis hystrir was low, and the pure Castanapsis hystrir forest was the lowest. Soil fertility was different between differently mixed ratio forest. With the numbers of Castanapsis hystrir increasing, soil fertility index of organic matter and total N and Hydrolytic N and Available P significantly enhanced. The study determinates that mixed ratio of 7 Cunninghamia lanceolata and 3 Castanapsis hystrir is the most appropriate.