攀枝花市麻疯树根际土壤内生菌根菌分布特征

Distribution of endomycorrhizae in Jatropha rhizosphere in Panzhihua City

摘要:

摘要：【目的】研究天然麻疯树根际土壤中内生菌根菌孢子果密度，揭示麻疯树根际土壤中内生菌根菌的分布特征，为麻疯树育苗繁殖和栽植推广提供科学依据。【方法】采用随机采样的方法对攀枝花市仁和区天然麻疯树根际土壤中内生菌根菌孢子果数量进行调查，确定了20个采样点，采集了20个土根混合样，利用解剖镜测定其孢子果密度，再根据1999年林业行标测定样品中的水分含量，养分含量等。【结果】天然麻疯树根际土壤采样从海拔1025m开始，直到1500m。土壤样品中均含有AM菌根菌孢子果，且数量丰富的，含量最高的土壤样品中AM菌根菌孢子果密度为236个/g干土，最小的密度为9个/g干土，平均密度为80个/g干土。土样含水量在4.01 %－13.39 %之间，平均值为6.79 %，与AM菌根菌孢子果含量正相关。有机质平均含量为3.80g/kg，与AM菌根菌孢子果含量正相关。【结论】天然麻疯树根际土壤中均能检测出AM菌根菌孢子果，且含量高，但分布不均。它的密度随着海拔高度的升高逐渐降低，随土壤含水量的增加而增加，随土壤有机质含量的增加而增加。

Abstract:

Abstract: [Objective] Concentration of endomycorrhizae spores in Jatropha rhizosphere were detected er to obtain the distribution characteristics of endomycorrhizae, for effective technical support in seedling, cultivation and afforesttation of Jatropha. [Methods] Concentration of endomycorrhizae spores in Jatropha rhizosphere were studied by random sampling method in Renhe borough of Panzhihua City. Then 20 samples of soil and root mixture from 20 sites were collected to measure the concentration of endomycorrhizae under macroscope. We analyzed soil moisture and organic matter on the basis of The Forestry Industry Standard issued in 1999. [Results] Rhizosphere soil samples from 1025m to 1500m altitude in natural Jatropha contained abundant Arbuscular mycorrhizas (AM) fungi spore. The highest number of AM fungi spore was 236/g dry soil, the lowest was 9/g dry soil, the average was 80/g dry soil. Soil moisture samples correlated positively with the number of AM fungi spores. Similarly, organic matter of soil correlated positively with the number of AM fungi spores. [Conclusion] AM fungi spores could be detected in the rhizosphere soil of natural Jatropha, with high concentration and asymmetrical distribution. The spore concentration was inversely correlated with the altitude whereas positively correlated with moisture and organic matter in the soil.