Effects of root pruning on physico-chemical characteristics and biological properties of winter jujube rhizosphere soil
Yang, S.J.,China Agricultural Univ., Yantai (China). Yantai Inst. | Du, Z.Y.,Shandong Forestry Academy, Jinan (China) | Yu, Y.,China Agricultural Univ., Yantai (China). Yantai Inst. | Zhang, Z.L.,China Agricultural Univ., Yantai (China). Yantai Inst. | Sun, X.Y.,China Agricultural Univ., Yantai (China). Yantai Inst. | Xing, S.J.,Shandong Forestry Academy, Jinan (China)
The root system of six-year-old winter jujube (Zizyphus jujuba cv. Zhanhua) trees were manually pruned at 3, 5 or 7 times trunk diameter distance along both inter-row sides to study the effects of root pruning on physicochemical characteristics and biological properties of winter jujube rhizosphere soil. The results showed that the root pruning of 3 and 5 times trunk diameter distance increased the available N, P and K concentrations, and pH values in the rhizosphere soil, and decreased organic matter concentrations, the contents of amino acids, organic acids and total sugars in the root exudates, the populations of bacteria, actinomyces and fungi. It also inhibited the activities of catalase, invertase and urease enzymes in contrast to the control in early stage when root pruning was applied. The determined indexes presented a reverse trend as those in early stage after new roots appeared. During the whole experiment, higher pesticide residues were observed in the rhizosphere of trees with pruned root systems than in the rhizosphere of control trees. No differences were noticed between 7 times trunk diameter distance and the control. Root pruning had a great impact on physicochemical characteristics and biological properties of the rhizosphere soil. This impact depends on root pruning intensity.
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