Changes in Land Use and their Effects on Soil Properties in Huixian Karst Wetland System
Changes in Land Use and their Effects on Soil Properties in Huixian Karst Wetland System
复制标题
辉县喀斯特湿地系统土地利用变化及其对土壤性质的影响
DOI：
10.15244/pjoes/65360
复制
发表时间：
2017-01-01
影响因子：
1.8
通讯作者：
Li, Qiang
中科院分区：
文献类型：
--
作者：
Li, Zhongyi;Jin, Zhenjiang;Li, Qiang
为了更好地了解土地利用变化对辉县喀斯特湿地系统的影响，对自然湿地、水田和旱地3种土地利用类型土壤微生物区系、酶活性和理化性质进行了分析。结果表明，旱地土壤pH、有机碳、全氮、阳离子交换量、交换性Ca、Mg、纤维素酶和碱性磷酸酶活性均显著低于水田和自然湿地（p0. 05）。旱地土壤微生物量碳、氮含量也低于水田和自然湿地，但差异不显著（p>0.05）。这表明，在碱性条件下，生物量高、微生物活性弱的天然湿地可能是一个重要的碳汇。在CCA双标图中，可以看到自然湿地集群与水田集群和旱地集群在同一象限中相交（尽管水田和旱地集群是分开的）。因此，在辉县岩溶湿地系统中，自然湿地通常被开垦为水田或旱地，直接用于农业生产。稻田具有淹水的条件，表现出与自然湿地相似的效果，可以视为人工湿地。鉴于稻田作为天然湿地的替代物具有相似的生态系统服务功能，如果天然岩溶湿地的退化趋势不能得到扭转，则应将稻田保留在辉县岩溶湿地系统中以发挥其生态系统服务功能。
To gain a better understanding of the impact from the land-use change in the Huixian karst wetland system, we analyzed soil microflora, enzyme activities, and physicochemical properties from three land-use types (natural wetland, paddy field, and dry farmland). The results showed that soil pH, soil organic carbon, total nitrogen, cation exchange capacity, exchangeable Ca and Mg, and the cellulase and alkaline phosphatase activities in the dry farmland were significantly lower than those in the paddy field and natural wetland (p0.05). Moreover, the soil microbial biomass carbon and nitrogen in the dry farmland were also lower than those in the paddy field and natural wetland, although no significant differences were observed (p>0.05). This suggests that, in the alkali condition, natural wetland with high biomass and weak microbial activity may be an important carbon sink. In the CCA biplot, it can be seen that the natural wetland cluster intersects with the paddy field cluster and the dry farmland cluster in the same quadrant (although the paddy field and the dry farmland clusters are separate). Therefore, we concluded that the natural wetland usually was reclaimed as paddy field or dry farmland directly for agricultural output in the Huixian karst wetland system. The paddy field has a waterlogged condition and shows the similar results to natural wetland, which can be regarded as artificial wetland. In view of the similar ecosystem services by paddy fields as substitutes of natural wetland, if the degradation trend of natural karst wetland can't be reversed, the paddy field should be preserved in the Huixian karst wetland system for its ecosystem service.