基于野外控制试验的不同持续时间干旱对喀斯特溶蚀的影响研究

doi:10.18306/dlkxjz.2021.10.008

Abstract

Abstract:

Karst dissolution is one of the most fundamental processes in the karst area, which is closely related to water and extremely prone to the impact of drought. Previous studies have shown that drought has a significant impact on karst dissolution. However, the magnitude of drought impact is unclear, especially the karst dissolution loss caused by different intensities of drought. The present study used a field control test to quantify the effects of 12 different drought durations on karst dissolution for the forest, shrub grassland, and cropland in central Guizhou Province using the standard carbonate tablets method. We also analyzed the drought influence mechanism of karst dissolution. The results show that drought has caused enormous karst dissolution loss and the loss percentage ranges from 30.61% to 83.33% for the forest area, 38.45% to 88.82% for shrub grassland, and 66.76% to 95.14% for cropland, respectively. According to the loss data of different soil layers, the deeper soil layers have higher karst dissolution loss under the impact of shorter duration drought, while the surface soil layers have lower karst dissolution loss. However, under the influence of more prolonged drought, the karst dissolution loss of surface soil layers is higher than the deeper soil layers. The mechanism of influence of drought indicates that soil moisture was the leading cause of karst dissolution loss, which plays a crucial role in karst dissolution loss caused by drought.

Key words: drought, different durations, karst dissolution, loss, field control test, standard carbonate tablets

LI Kaizhong, XU Zhongchun, LV Xiaoxi, DONG Yingping, WANG Hengsong. Quantifying the effect of drought with different durations on karst dissolution based on field control test[J].PROGRESS IN GEOGRAPHY, 2021, 40(10): 1704-1715.

Figures/Tables 9

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References 38

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干旱持续时间/月	自然溶蚀/(mg/cm²)			干旱溶蚀/(mg/cm²)			数量损失/(mg/cm²)			损失比重/%
干旱持续时间/月	林地	灌草地	耕地	林地	灌草地	耕地	林地	灌草地	耕地	林地	灌草地	耕地
1	0.1199	0.1649	0.3436	0.0772	0.1015	0.1142	0.0427	0.0634	0.2294	35.61	38.45	66.76
2	0.2052	0.3782	0.5903	0.1279	0.1464	0.1372	0.0773	0.2318	0.4531	37.67	61.29	76.76
3	0.2410	0.3413	0.7022	0.1499	0.0830	0.1303	0.0911	0.2583	0.5719	37.80	75.68	81.44
4	0.2410	0.3874	0.8509	0.1269	0.0599	0.1199	0.1141	0.3275	0.7310	47.34	84.54	85.91
5	0.2525	0.4600	1.0769	0.1752	0.1049	0.1015	0.0773	0.3551	0.9754	30.61	77.20	90.57
6	0.4451	0.5096	1.5416	0.1442	0.1718	0.1269	0.3009	0.3378	1.4147	67.60	66.29	91.77
7	0.5327	0.5534	1.9912	0.0888	0.1199	0.0968	0.4439	0.4335	1.8944	83.33	78.33	95.14
8	0.6053	0.6042	2.2357	0.1072	0.1292	0.1361	0.4981	0.4750	2.0996	82.29	78.62	93.91
9	0.7541	0.6192	2.5251	0.1638	0.0692	0.1269	0.5903	0.5500	2.3982	78.28	88.82	94.97
10	0.8694	0.8417	3.1154	0.1591	0.1245	0.1995	0.7103	0.7172	2.9159	81.70	85.21	93.60
11	0.9351	1.1657	3.4671	0.1868	0.1418	0.1937	0.7483	1.0239	3.2734	80.02	87.84	94.41
12	0.9639	1.2475	3.9202	0.2271	0.1441	0.2156	0.7368	1.1034	3.7046	76.44	88.45	94.50

干旱持续时间/月	林地溶蚀损失			灌草地溶蚀损失			耕地溶蚀损失
干旱持续时间/月	-5 cm	-25 cm	-45 cm	-5 cm	-25 cm	-45 cm	-5 cm	-25 cm	-45 cm
1	0.0069	0.0553	0.0657	0.0450	0.0657	0.0796	0.2836	0.1937	0.2110
2	0.0173	0.0761	0.1384	0.1937	0.2110	0.2906	0.4358	0.4012	0.5223
3	0.0450	0.1280	0.1003	0.2767	0.2145	0.2836	0.5327	0.6607	0.5223
4	0.0380	0.0934	0.2110	0.3079	0.3597	0.3148	0.6468	0.6849	0.8613
5	0.0519	0.0208	0.1591	0.2283	0.4116	0.4255	0.8751	0.9651	1.0861
6	0.1557	0.3874	0.3597	0.3874	0.2940	0.3321	1.4459	1.3559	1.4424
7	0.4531	0.3736	0.5050	0.4566	0.3563	0.4877	1.5808	1.9094	2.1930
8	0.3978	0.5361	0.5604	0.5119	0.3978	0.5154	1.8333	2.0927	2.3729
9	0.5119	0.5569	0.7022	0.6399	0.4635	0.5465	1.8298	2.0927	3.2722
10	0.6883	0.7437	0.6987	0.7817	0.6607	0.7091	2.4697	2.4732	3.8049
11	0.7299	0.5431	0.9720	1.3974	0.8648	0.8094	3.2722	2.8191	3.7288
12	0.7091	0.4946	1.0066	1.3801	1.1207	0.8094	3.7738	3.0854	4.2546

干旱持续时间/月	林地溶蚀损失			灌草地溶蚀损失			耕地溶蚀损失
干旱持续时间/月	-5 cm	-25 cm	-45 cm	-5 cm	-25 cm	-45 cm	-5 cm	-25 cm	-45 cm
1	9.09	42.11	43.18	28.89	45.24	41.07	66.13	65.12	69.32
2	9.62	44.00	52.63	56.00	56.48	70.00	72.83	77.85	79.47
3	29.55	44.05	35.80	78.43	66.67	81.19	79.79	84.51	79.47
4	21.15	39.71	68.54	84.76	83.87	85.05	84.62	85.34	87.37
5	23.08	10.34	47.92	68.04	83.22	77.36	91.01	90.58	90.23
6	55.56	74.67	67.10	70.44	63.91	64.00	94.78	90.95	89.68
7	82.91	75.00	91.25	81.48	70.07	82.46	96.82	95.83	93.37
8	82.14	89.08	76.78	87.57	70.55	77.60	96.54	93.36	92.45
9	81.32	72.85	80.88	96.35	84.81	84.49	96.01	94.53	94.69
10	84.68	80.52	80.16	85.61	84.89	85.06	95.58	93.96	92.13
11	80.84	73.02	83.88	91.40	86.81	83.27	95.75	94.77	93.01
12	77.65	66.51	81.51	92.15	88.77	82.39	96.04	94.49	93.18

土地类型	喀斯特溶蚀损失			土壤水分		土壤pH
土地类型	土壤水分	土壤pH	土壤有机质	土壤pH	土壤有机质	土壤有机质
林地	-0.628^*	0.413	-0.513	-0.570^*	0.307	-0.330
灌草地	-0.455	0.467	-0.627^*	-0.573^*	-0.038	-0.055
耕地	-0.605^*	0.699^**	-0.781^**	-0.907^**	0.769^**	-0.805^**

Quantifying the effect of drought with different durations on karst dissolution based on field control test

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