哈尼梯田水源区3种典型植被下不同水体的氢氧稳定同位素特征及相互关系

doi:10.11707/j.1001-7488.20220501

Abstract

Abstract:

Objective: Three different vegetation types of water source forests (arbor forest, shrub forest and grassland) in the Quanfuzhuang small watershed were in vestigated by a quantitative analysis of the soil water transportion, the source of water and the proportion of recharge to shallow groundwater of 0~100 cm soil layer to reveal the influence of three vegetation types on soil water migration. The result of this study provides a scientific basis for quantitativel analysis of water cycle process of the forest-terrace complex ecosystem and sustainable development of Hani Terrace irrigation area. Method: We examined the hydrogen and oxygen stable isotope characteristics of different water bodies under the three regetation types from April to December 2015, and the variation characteristics of δ¹⁸O value of soil water with soil depth using hydrogen and oxygen stable isotope technique on different dates(July 24, July 29, and August 3, 2015) in three vegetation types, analyzed the relationship of δ¹⁸O values between soil water and the potential water sources (precipitation and shallow underground water, etc.), and further determined the source of soil water in the three vegetation types. The contribution rate of precipitation and groundwater to soil water, surface water and soil water to groundwater were calculated according to binary linear mixed model. Result: The mean values of hydrogen and oxygen stable isotopes in the five water bodies decreased in an orderly way, with shallow groundwater being observed to have the greatest amount, followed by surface water, then soil water of arboreal lands, then soil water of shrubland, then soil water of grassland, finally Precipitation. The coefficient of variation of precipitation was the largest, and the coefficient of variation of surface water and shallow groundwater was smaller. Soil water in grassland was mainly recharged by precipitation, accounting for 67.02%. Soil water in arboreal lands and shrubland was mainly recharged by the rising of deep soil water, accounting for 59.65% and 50.18% respectively. Under the condition of short-burst rainstorm, the water transportation rate of the three forestlands in the early and late stages of monitoring were different. And the main transport ation ranges of soil water in arboreal lands and shrubland were 0-70 cm, while the main transport ranges of soil water in grassland was 0-50 cm. The vertical transportation of soil water was the main form of shallow groundwater recharge. The shallow groundwater recharge ratio by soil water of grassland was 55.91%, and it was significantly higher than that of arboreal lands and shrubland. Conclusion: The vegetation type had certain influence on the characteristic of soil water cycling in the study area, forestland had a strong utilization of deep soil water, and the grassland was more conducive to precipitation infiltration and shallow groundwater recharge.

Key words: vegetation type, hydrogen and oxygen stable isotopes, water transportation, water cycling, Hani Terrace

CLC Number:

Huimei Pu,Yuan Li,Jinkui Wu,Ze Ma,Weifeng Song. Characteristics and Interrelations of Hydrogen and Oxygen Stable Isotopes among Different Water Bodies under Three Typical Vegetation in The Water Conservation Area of Hani Terrace[J]. Scientia Silvae Sinicae, 2022, 58(5): 1-9.

Figures/Tables 7

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植被类型 Vegetation type	样方 Quadrat	经纬度 Latitude and longitude	海拔 Altitude/m	坡向 Aspect	主要植物 Major plant species	盖度 Cover degree (%)
乔木林 Arbor forest	A-1	102°46′10″E， 23°5′37″N	2 022.8	东 East	西南山茶Camellia pitardii、白花悬钩子Rubus Leucanthus、土茯苓Smilax glabra	80
	A-2	102°46′11″E， 23°5′37″N	2 020.9		印度木荷Schima khasiana、野牡丹Melastoma candidum、金粉蕨onychium japonicum	90
	A-3	102°46′11″E， 23°5′37″N	2 020.5		灰木Symplocos pilosa、香面叶Lindera caudata.、菝契Smilax china	85
灌木林 Shrub forest	S-1	102°46′17″E， 23°5′44″N	1 976.5	东 East	粗梗连蕊茶C.crassipes、臭牡丹Clerodendrum bungee、团花新木姜子Neolitsea homilantha	98
	S-2	102°46′18″E， 23°5′44″N	1 968.1		大理茶C. taliensis、云南连蕊茶C. tsaii、喜花草Eranthemum pulchellum	98
	S-3	102°46′18″E， 23°5′45″N	1 966.8		翠云草Selaginella uncinate、野草莓Fragaria vesca、毛叶滇南杜鹃Rhododendron tutcherae	96
荒草地 Grassland	G-1	102°46′16″E， 23°5′57″N	1 924.2	东 East	爵床Rostellularia procumbens	90
	G-2	102°46′16″E， 23°7′27″N	1 923.8		叶下珠Phyllanthus urinaria	85
	G-3	102°46′16″E， 23°5′51″N	1 921.5		芨草Achnatherum splendens	90

水体类型 Water body type	植被类型 Vegetation type	δ D (‰)				δ ¹⁸O (‰)
水体类型 Water body type	植被类型 Vegetation type	最大值 Maximum	最小值 Minimum	均值 Average	标准差 Std. deviation	最大值 Maximum	最小值 Minimum	均值 Average	标准差 Std. deviation
降水Precipitation		-19	-142	-73.8	28.05	-3.3	-18.7	-10.31	3.58
地表水Surface water		-35	-80	-66.5	10.80	-5.8	-11.4	-9.57	1.68
浅层地下水 Shallow groundwater		-56	-75	-65.7	6.38	-8.4	-10.9	-9.55	0.99
土壤水 Soil water	乔木林 Arbor forest	-35	-90	-68.4	10.09	-5.3	-12.2	-9.68	1.34
	灌木林 Shrub forest	-37	-87	-70.4	9.42	-5.1	-11.9	-9.82	1.28
	荒草地 Grassland	-42	-88	-71.9	9.57	-5.7	-12.3	-10.02	1.26

水体类型 Water body type	植被类型 Vegetation type	氢氧同位素关系 Relationship between δ D and δ¹⁸O	R	P	样品数 Number of samples
降水Precipitation		δ D=7.718 δ¹⁸O+5.394	0.990	0.000	65
地表水Surface water		δ D=5.773 δ¹⁸O -11.285	0.900	0.002	14
浅层地下水 Shallow groundwater		δ D=6.103 δ¹⁸O-7.389	0.944	0.001	9
土壤水 Soil water	乔木林Arbor forest	δ D=7.205 δ¹⁸O+1.163	0.955	0.000	176
	灌木林Shrub forest	δ D=7.180 δ¹⁸O+0.145	0.977	0.000	171
	荒草地Grassland	δ D=7.298 δ¹⁸O+1.347	0.958	0.000	177

植被类型 Vegetation type	δ¹⁸O (‰)			补给比例 Conversion ratio (%)
植被类型 Vegetation type	降水 Precipitation	浅层地下水 Shallow groundwater	土壤水 Soil water	降水 Precipitation	浅层地下水Shallow groundwater
乔木林Arbor forest	-13.48	-10.63	-11.78	40.35	59.65
灌木林Shrub forest	-13.48	-10.63	-12.05	49.82	50.18
荒草地Grassland	-13.48	-10.63	-12.54	67.02	32.98

植被类型 Vegetation type	δ¹⁸O (‰)			补给比例 Conversion ratio (%)
植被类型 Vegetation type	地表水 Surface water	浅层地下水 Shallow groundwater	土壤水 Soil water	地表水 Surface water	土壤水 Soil water
乔木林地Arbor forest	-9.56	-10.27	-11.75	67.58	32.42
灌木林地Shrub forest	-9.56	-10.27	-11.38	60.99	39.01
荒草地Grassland	-9.56	-10.27	-10.83	44.09	55.91

Characteristics and Interrelations of Hydrogen and Oxygen Stable Isotopes among Different Water Bodies under Three Typical Vegetation in The Water Conservation Area of Hani Terrace

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