摘要
混交林在不同立地类型条件下 ,有不同的生长表现 ,通常以北坡、坡度 10°以下、山下腹、土层厚 >30cm的立地类型较好。辽东区域的林分乔木层生物生产力 ,比辽西和辽南区域提高32 %～ 58% ,混交林生物生产量随年龄增长呈递增趋势 ,生物生产力呈递减趋势。混交林生物生产力与水、热关系明显 ,当年降水量 >70 0mm ,且年均气温在 5～
Mixed stands showed different growth status under the condition of various site quality types and grew better commonly under the condition of site quality type that is northern slope, slope below 10° ,lower parts of mountains and depth of soil layer>30cm .Biological productivity of stands and arboreous layers in eastern Liaoning were 32%～58% higher than that in western and southern Liaoning, biological yield of mixed stands showed a trend of progressive increase as the age increased and biological productivity showed a trend of progressive decrease .The relationship of biological productivity of mixed stands with water and heat was significant, direct effective appeared when the annual rainfall>700mm and annual average temperature was among 5～8℃.
出处
《辽宁林业科技》
2000年第4期9-12,共4页
Liaoning Forestry Science and Technology
