| 不同土地利用类型下土壤碳酸酐酶剖面分异特征研究 |
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| 引用本文： | 何媛媛,李 强,曹建华,梁建宏,朱敏洁.不同土地利用类型下土壤碳酸酐酶剖面分异特征研究[J].中国岩溶,2013,32(4):365-370. |
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| 作者姓名： | 何媛媛 李 强 曹建华 梁建宏 朱敏洁 |
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| 作者单位： | 中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室；广西民族师范学院附属中学;中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室;中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室;中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室;中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室 |
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| 基金项目： | ：国家自然科学基金项目（40872213和41003038）； 广西自然科学基金重点项目（2011GXNSFD018002）；中国地质调查局项目（1212010911062，12120113005300）和国土资源部公益性行业专项（201211086－05） |
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| 摘 要： | 利用pH计法来研究西南岩溶区4类土地利用类型11个样地20cm、40cm和60cm土层碳酸酐酶(Carbonic Anhydrase,CA)的剖面分异特征,并与非岩溶样地进行对比。结果表明:西南岩溶区不同土地利用类型不同土层的CA活性存在较大差异。在林地中,40cm和60cm土层的CA活性明显高于20cm土层;而在乔灌丛、灌丛和耕地中,土壤CA活性表现出60cm土层处最高,20cm土层处最低,并与弃耕地不同土壤层CA活性变化趋势截然相反,这是因为弃耕地受人类活动干扰导致土壤CA活性出现逆转。进一步分析还可以看出林地、乔灌丛、灌丛和耕地4种土地利用类型下土壤CA活性总体呈现出随植物根系深度增加而增加的变化趋势,从而说明土地利用类型是导致土壤碳酸酐酶剖面产生分异的主要因素,并为进一步研究土壤CA在自然界碳酸盐岩风化过程中的作用提供了科学依据。
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| 关 键 词： | 碳酸酐酶 土地利用类型 岩溶土壤 pH 计法 |
| 收稿时间： | 2013/7/23 0:00:00 |
Spatial differentiation of soil carbonic anhydrase under different types of land use |
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| HE Yuanyuan,LI Qiang,CAO Jianhu,LIANG Jianhong and ZHU Minjie.Spatial differentiation of soil carbonic anhydrase under different types of land use[J].Carsologica Sinica,2013,32(4):365-370. |
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| Authors: | HE Yuanyuan LI Qiang CAO Jianhu LIANG Jianhong and ZHU Minjie |
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| Institution: | 1. Institute of Karst Geology, CAGS /Key Laboratory of Karst Dynamics, MLR ＆ GZAR, Guilin, Guangxi 541004,China; 2. The Middle School Attached to Guangxi Normal University for Nationalities, Chongzuo,Guangxi 532200,China) |
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| Abstract: | Carbonic anhydrase （CA）plays an important role in catalyzing the reversible hydration of CO 2 , which connects with chemical weathering （including the carbonate rock dissolution and silicate weathering） in atmospheric CO 2 sink and the mysterious missing sink in carbon cycling.In order to explore the soil CA activity by means of pH method from different types of land use in southwest China karst area,1 1 sampling plots from four different karst ecosystems and 5 sampling plots from non-karst ecosystems as a contrast are selected for the study.The results show that there are larger differences in soil CA activity among different soil layers under different types of land use in southwest China karst area.Under woodland,the soil CA ac-tivity in 40 cm and 60 cm soil layers is higher than that in 20 cm.The soil CA activity under tree-shrub land, shrub land and farmland is the highest in 60 cm soil layer,but the lowest in 20 cm.However,in abandoned field,soil CA activity is the highest in 20 cm soil layer but the lowest in 60 cm.It can be seen that the land use type is the main factor affecting the soil CA activity.The soil CA activity increases with the plant root depth due to the CO 2 increases along with the soil depth. 〈br〉 Moreover,karst landform is another important factor that affects the soil CA activity.For example,in the Yaji karst experimental site,the soil CA activity is controlled by the physiognomy character due to the weathering product of carbonate rock and organic matter migration from the bealock and piedmont slope to the karst depression.So,the soil microbe will be assembled,which lead to the soil CA activity in 20 cm lay-er at depression is 0.782 U/g and higher than those at the bealock and piedmont slope.At last,we also need to consider the effect from the change of sample sites.For the future comparison,the samples should be col-lected at the border of the same site.Then,the research can provides a certain theoretical basis for further study on the role of soil CA activity in karst processes. |
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| Keywords: | carbonic anhydrase type of land use karst soil pH method |
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