林业科学2012，Vol.48Issue(1)：1-6,6.
巴山冷杉-牛皮桦混交林乔木更新及土壤化学性质对更新的影响
Tree Regeneration in an Abies fargesii-Betula utilis Mixed Forest and Effects of the Soil Chemical Properties on Regeneration
摘要
Abstract
Tree regeneration understory and in gaps of an Abies fargesii-Betula utilis mixed forest and the soil chemical properties were investigated in Taibai Mountain, China, and the effects of gaps and the soil chemical properties on tree regeneration were analyzed. The results showed that there was low tree regeneration density in the Abies fargesii-Betula utilis mixed forest (0.059 trees.m-2) , but the regeneration amount of Abies fargesii was dominant no matter in gap or understory. The difference of tree regeneration densities was not significant between understory and in gap (P =0. 160) , however, the seedling density of Abies fargesii in gap was significantly higher than in understory (P. =0. 012). Correlation analysis indicated that small gaps were more conducive to the regeneration of Abies fargesii ( r = - 0. 397 , P = 0. 030 ) , while gap size had no significant effect on the regeneration of Betula utilis ( r = 0. 125 ,P = 0. 511 ) . In understory, the regeneration density of Betula utilis was significantly positively correlated with soil alkali-hydrolyzable N content, total P content and pH. In gap, the regeneration density of Abies fargesii was significantly negatively correlated with soil total P content and available P content, and the sapling density of Betula utilis was significantly negatively correlated with soil total P. The other soil chemical properties understory ( organic matter content, total N content and available P content) and in gaps (pH, organic matter content, total N content and alkali-hydrolyzable N content) had no significant correlation with the regeneration densities of Betula utilis and Abies fargesii. Soil pH was significantly higher in understory than in gaps, whereas organic matter content, total N content, alkali-hydrolyzable N content, total P content and available P* content were significantly lower than in gaps.关键词
乔木更新/林下/林隙/土壤化学性质/太白山Key words
tree regeneration/understory/gap/soil chemical properties/Taibai Mountain分类
农业科技引用本文复制引用
任学敏,杨改河,秦晓威,王得祥,刘振学,赵双喜,白宇..巴山冷杉-牛皮桦混交林乔木更新及土壤化学性质对更新的影响[J].林业科学,2012,48(1):1-6,6.基金项目
科技基础性专项重点项目(2007FY110800) （2007FY110800）
林业公益性行业专项(200804022B) （200804022B）
国家自然科学基金(31070570) （31070570）
