Activities of selected soil enzymes (invertase, acid phosphatase, proteinase, catalase, peroxidase and polyphenoloxidase) were determined under different spruce forests with restoration histories of 5, 13, 18, 23, 27 ...Activities of selected soil enzymes (invertase, acid phosphatase, proteinase, catalase, peroxidase and polyphenoloxidase) were determined under different spruce forests with restoration histories of 5, 13, 18, 23, 27 years and an old growth forest over 400 years old in the eastern Qinghai-Tibetan Plateau, China, and their possible use as indicators of ecosystems health were analyzed. Plots 10 × 10 m with 4 replications were established to investigate three hypotheses: soil enzyme activities a) would increase with the restoration process; b) would be greater in surface soils than at lower depths; and c)would be correlated to selected physicochemical properties. Results showed that as the forests developed after restoration,invertase and peroxidase activities usually increased up to the 23 year point. Also soil enzyme activities were associated with surface soils and decreased with depths, suggesting that in earlier restoration stages surface addition of organic fertilizer to soils might be more effective than additions at depth. In the 0-20 cm soil, there were significant correlations (P ＜ 0.01 or ＜ 0.05) between some soil enzyme activities and some selected chemical properties. Therefore, temporal changes in enzyme activities should be included as an indicator when evaluating sustainable forest management practices.展开更多
Six soil enzymes (invertase, acid phosphatase, proteinase, catalase,peroxidase and polyphenoloxidase) were chosen for investigation under different spruce forests withrestoration ages of 4, 10, 16 years and an old-gro...Six soil enzymes (invertase, acid phosphatase, proteinase, catalase,peroxidase and polyphenoloxidase) were chosen for investigation under different spruce forests withrestoration ages of 4, 10, 16 years and an old-growth spruce forest over 400 yearsold in the easternQinghai-Tibet Plateau, China. Results showed that the activities of invertase, phosphatase,proteinase, catalase and peroxidase decreased in newly restored forests except forpholyphenoloxidase. With the development of forests after restoration, the activities of invertase,acid phosphadase, proteinase increased gradually. Our study also indicated that the soil enzymeactivities were associated with surface soils and decreased with depths. This result suggested thatin the earlier restoration stage the application of organic fertilizer may be more effective bysurface addition to soils than deep addition.展开更多
基金Project supported by the Knowledge Innovation Project of the Chinese Academy of Sciences (Nos. KZCX3-SW-339 and KSCX1-07) the Ministry of Science and Technology of China (No. 2001CCB00600).
文摘Activities of selected soil enzymes (invertase, acid phosphatase, proteinase, catalase, peroxidase and polyphenoloxidase) were determined under different spruce forests with restoration histories of 5, 13, 18, 23, 27 years and an old growth forest over 400 years old in the eastern Qinghai-Tibetan Plateau, China, and their possible use as indicators of ecosystems health were analyzed. Plots 10 × 10 m with 4 replications were established to investigate three hypotheses: soil enzyme activities a) would increase with the restoration process; b) would be greater in surface soils than at lower depths; and c)would be correlated to selected physicochemical properties. Results showed that as the forests developed after restoration,invertase and peroxidase activities usually increased up to the 23 year point. Also soil enzyme activities were associated with surface soils and decreased with depths, suggesting that in earlier restoration stages surface addition of organic fertilizer to soils might be more effective than additions at depth. In the 0-20 cm soil, there were significant correlations (P ＜ 0.01 or ＜ 0.05) between some soil enzyme activities and some selected chemical properties. Therefore, temporal changes in enzyme activities should be included as an indicator when evaluating sustainable forest management practices.
文摘Six soil enzymes (invertase, acid phosphatase, proteinase, catalase,peroxidase and polyphenoloxidase) were chosen for investigation under different spruce forests withrestoration ages of 4, 10, 16 years and an old-growth spruce forest over 400 yearsold in the easternQinghai-Tibet Plateau, China. Results showed that the activities of invertase, phosphatase,proteinase, catalase and peroxidase decreased in newly restored forests except forpholyphenoloxidase. With the development of forests after restoration, the activities of invertase,acid phosphadase, proteinase increased gradually. Our study also indicated that the soil enzymeactivities were associated with surface soils and decreased with depths. This result suggested thatin the earlier restoration stage the application of organic fertilizer may be more effective bysurface addition to soils than deep addition.
