游憩压实土壤对黄波椤根系形态结构及活力的影响  

Effects of Soil Compaction Caused by Recreation on Fine Root Structure and Metabolic Activity in Phelodendron amurense

作　　者：谷加存[1] 牟琦[1] 郑曈[1] 

机构地区：[1]东北林业大学,哈尔滨150040

出　　处：《东北林业大学学报》2011年第11期12-14,共3页Journal of Northeast Forestry University

基　　金：东北林业大学本科生创新性实验项目(10102250127);中央高校基本科研业务费(DL09BA07)

摘　　要：以森林公园内的黄波椤(Phelodendron amurense Rupr.)风景林为对象,研究了游憩压实土壤对黄波椤1～3级根(根系最末端为1级根)的形态结构和活力,以及土壤物理性质的影响。结果表明:压实导致土壤表层(0～10 cm)密度显著增加,最大持水量、毛管持水量、总孔隙度和土壤通气度均显著下降,但在亚表层(>10～20 cm)仅密度显著增加。相比较,黄波椤细根受到压实的影响较弱,只有1级和2级根之间分支比例显著地下降,而1～3级根的直径、比根长、组织密度和活力在压实与对照之间均无显著差异。因此,黄波椤根系的分支结构受土壤压实的影响较大,而单根水平上的吸收能力、代谢活性所受影响较小。A study was conducted to explore the effects of soil compaction induced by recreation on the morphological structure and metabolic activity of the first three orders of fine roots of Phelodendron amurense as well as soil physical properties. Results showed that soil compaction significantly increased soil bulk density, but decreased maximum water holding capacity, capillary water holding capacity, total porosity, and soil aeration at 0-10 cm soil depth. At 10-20 cm soil depth, however, ouly soil bulk density increased after soil compaction. Soil compaction had weak effects on fine roots of P. amurense. Branch ratio between the first- and second-order roots significantly decreased after soil compaction, while root diameter, specific root length, tissue density and metabolic activity of the first three orders of roots did not change significantly. Soil compaction caused by recreation has a stronger effect on fine root structure than on uptake capacity and metabolic activity at the individual root level.

关 键 词：游憩压实 土壤质量 根系形态 黄波椤 

分 类 号：S718.52[农业科学—林学]