Soil Microbial Ecological Characteristics of Pear Orchard with Different Ages in Eastern Henan Province
In order to evaluate the microbial ecological characteristics in pear orchards of different ages,the characteristics of soil enzyme activity and soil microbial quantity distribution in different soil depths of pear orchard with six different ages were investigated in Ningling county,Shangqiu,Henan province.The results showed that the soil organic matter content decreased with the increase of age and soil depth.The soil invertase and urease activity decreased with the soil depth increasing.Compared of different ages,the activity of soil invertase activity increased first and then decreased with the increase of tree age.It was highest in 10-year pear orchard,and it was 6.42％-24.02％ higher than others.The soil microbial groups in different pear orchards were mainly bacteria,and the bacteria number decreased with the tree age increasing.The number of soil bacteria in pear orchard was 3.26 × 107-33.96 × 107 cfu/g.The number of fungi showed the mature pear orchards (10 a and 22 a) ＞ aged pear orchards (53 a and 89 a) ＞ young pear orchards (3 a and 5 a),and the number of fungi was 3.71 × 103-21.74 × 103 cfu/g.It was highest of actinomycetes in the aged pear orchards.The average number of actinomycetes in 89-year pear orchard reached 13.27 × 104 cfu/g,which was 2.64 × 104-9.49 × 104 cfu/g higher than others.The distribution rule of bacteria,fungi and actinomycetes in different soil layers was similar,and it decreased gradually with the increase of soil depth.The correlation analysis showed that there was a significant negative correlation between age and soil organic matter content,the number of soil bacteria.And age also showed a highly significant negative correlation with the soil urease activity,and a highly significant positive correlation with the number of actinomycetes.The distribution of soil microorganisms in pear orchard is related to the tree age.It is necessary to carry out reasonable soil regulation and management in order to improve the yield and quality of fruit trees.
国家科技期刊平台
NSTL
万方数据
维普
