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| Dynamics Study on Soil Enzyme Activity, Microbial Biomass and Inorganic Nitrogen of Juglans sigillata Forest in Karst Area |
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| DOI：10.16768/j.issn.1004-874X.2020.10.011 |
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| Abstract: |
| 【Objective】Soil texture is an important factor for the yield of Juglans sigillata. The study on soil fertility and microbial community function in karst area is not only helpful to guide the scientific and efficient production of Juglans sigillata, but also to provide theoretical basis for the rocky desertification control and land restoration practice in this area.【Method】To better understand the changes in soil conditions after forestation, the changes in three components-soil enzyme activity, microbial biomass（carbon, nitrogen）and inorganic nitrogen（nitrate nitrogen, ammonium nitrogen）-in the J. sigillata forests had been planted for different periods（4, 5, 6 and 7 years）in the karst area were measured and analyzed.【Result】（1）After 5 and 6 years’ planting of J. sigillata, soil enzyme activity was generally higher than that after 4 and 7 years’ planting.（2）With the increase of planting years, soil microbial biomass carbon showed a trend of increasing first and then decreasing, while the microbial biomass nitrogen gradually increased, and there was no significant difference after 5, 6 or 7 years’ planting. The soil microbial biomass carbon and nitrogen contents after 4 years’ planting were significantly lower than those of other planting years.（3）With the increase of planting years, ammonium nitrogen content showed a fluctuating trend, while the nitrate nitrogen content increased first and then decreased, and the nitrate nitrogen after 6 years’ planting was significantly higher than that of other planting years.（4）The soil enzyme activity, microbial biomass and inorganic nitrogen contents all decreased with the increase of soil depth（0-10, 10-20 and 20-30 cm）, showing an obvious surface aggregation phenomenon.（5）Soil enzyme activity, microbial biomass and inorganic nitrogen contents had
correlation to different degrees.【Conclusion】Generally speaking, the afforestation of J. sigillata forests is beneficial to the soil development in karst area. In addition, attention should be paid to water and fertilizer management after 7 years’ planting to improve the quality of J. sigillata fruits, and provide basic conditions for ecological restoration in this area. |
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