Research on Change of Rhizosphere Soil Properties of Chinese fir Plantation
摘要
This article emphatically reviews the difference of soil biological activities, biochemical activities and soil chemical properties between the rhizosphere and non-rhizosphere soil of first rotation of Chinese fir (Cunninghamia lanceolata (Lamb) Hook) plantation. It also reviews their dynamic patterns during Chinese fir plantation development. The results show that the contents of organic and inorganic nutrients in the rhizosphere soil of young, half-mature and near-mature Chinese fir of first-rotation are more than those in non-rhizosphere soil; except for total K in young Chinese fir plantation. Various patterns of soil nutrients in different stages of Chinese fir plantation development are as follows: available N shows the trend of declination in both rhizosphere soil and non-rhizosphere soil; the content of available P also declines, only increases a little from half-mature stage to near-mature stage, but total P decreases from the beginning to the end. The content of available K increases from young stage to half-mature stage, but decline from half-mature stage to near-mature stage both available K and total K. The contents of Cu, Zn and Mn decrease greatly from young stage to half-mature stage, and rehabilitate a little from half-mature stage to near-mature stage in non-rhizosphere soil. As for the variation of the soil enzyme activity, both hydrolytic enzyme and oxidizing enzyme are less active in rhizosphere soil than in non-rhizosphere soil at young stage. However, when Chinese fir become into mature, the activities of soil enzymes are higher in rhizosphere soil than those in non-rhizosphere soil. The results of soil micro-flora show that the quantity of bacteria, actinomyces, fungi in rhizosphere soil is more than that in non-rhizosphere soil in the young Chinese fir plantation. The quantity of bacteria and fungi decreases in rhizosphere and non-rhizosphere soil, but the quantity of actinomyces increases along with the Chinese fir becoming into half-mature