民勤绿洲边缘阻沙带表层土壤粒度空间分布特征

doi:10.13866/j.azr.2021.05.15

Abstract

Abstract:

Soil particle size is an important characteristic parameter of sand drift activity. Through field investigation and indoor test, this paper explored the grain size characteristics of surface soil at the windbreak and sand fixation forest with different spatial distribution, to evaluate the function of the sand barrier belt on the edge of Minqin Oasis. According to the results, the grain size composition in the surface soil of Haloxylon ammodendron-Artemisia desertorum-Agriophyllum squarrosum fixing forest in Baqu was mainly fine sand, medium sand, and very fine sand, which accounts for 33.47%, 26.08%, and 18.18%, respectively. The grain size composition in the surface soil of Nitraria tangutorum-Artemisia desertorum-Bassia dasyphylla fixing forest in Quanshanqu was dominated by fine sand, silt, and very fine sand, which accounts for 29.62%, 21.17%, and 18.87%, respectively. The grain size composition in the surface soil of Nitraria tangutorum-Phragmites australis- Salsola collina fixing forest in Huqu mainly consisted of fine sand, silt, and very fine sand, which accounts for 36.66%, 27.98%, and 22. 83%, respectively. Average particle size, Baqu (2.55 Φ) > Quanshanqu (3.5 Φ) > Huqu (3.94 Φ). Grain size sorting in Baqu (1.58 Φ) was poor, grain size sorting in Quanshanqu (2.29 Φ) and Huqu (2.10 Φ) were also very poor. The frequency curve of grain size in Quanshanqu and Huqu is of double peak type, while that in Baqu is of single peak type. The skewness is extremely positive, and the kurtosis is very narrow. The cumulative distribution curve of grain size shows that the aeolian sand activity in Baqu is more frequent and intense than that in the Quanshanqu and Huqu. The specie composition of the desert vegetation community determines the function of windbreak and sand fixation in the sand-blocking belt and then affects the grain size distribution of the topsoil. It suggested that forestation tree species with strong sand-fixing ability should be selected when the ecological protection system of sand-blocking belt is restored.

Key words: sand-resitant belt, grain size characteristics, fixing vegetation, wind break and sand-fixing function, Minqin Oasis

ZHAO Peng,ZHU Shujuan,DUAN Xiaofeng,CHANG Zhaofeng,KANG Caizhou,WANG Fanglin,WANG Yuqi,GAO Decai. Spatial distribution characteristics of grain size of surface soil in the sand-resitant belt of Minqin Oasis marginal[J].Arid Zone Research, 2021, 38(5): 1335-1345.

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区域	样带名称	群丛类型	土壤类型	微地貌
坝区	龙王庙	沙拐枣-沙蒿-沙米	风沙土	半固定沙丘
	宋和	梭梭+沙拐枣-五星蒿	风沙土	半固定沙丘
	沙井子	白刺+梭梭-沙米	风沙土	半固定沙丘
泉山区	勤锋滩	梭梭+白刺-沙蒿	风沙土	灌丛沙堆
	刘家地	柽柳+白刺+红砂	风沙土	灌丛沙堆
	三角城	白刺+红砂-猪毛菜	风沙土	灌丛沙堆
湖区	扶拱	梭梭+白刺-黄花矶松	风沙土	半固定沙丘
	青土湖1	白刺+黑果枸杞-芦苇	湖相沉积物	灌丛沙堆
	青土湖2	白刺+盐爪爪-盐生草	湖相沉积物	灌丛沙堆

区域	黏粒 <0.002 mm	粉粒 0.002~0.05 mm	极细砂 0.05~0.1 mm	细砂 0.1~0.25 mm	中砂 0.25~0.5 mm	粗砂 0.5~1.0 mm	极粗砂 1.0~2.0 mm
坝区	2.16±1.6	12.46±12.54	18.18±8.42	33.47±9.86	26.08±12.73	7.42±7.00	0.23±0.72
泉山区	4.25±3.39	21.17±18.76	18.87±9.97	29.62±14.49	17.51±10.00	7.56±10.18	1.02±2.76
湖区	4.16±3.89	27.98±25.08	22.83±8.93	36.66±21.01	8.30±7.33	0.07±0.22	0±0

区域	参数				沉积环境
区域	Y1	Y2	Y3	Y4	沉积环境
龙王庙	3.302961	208.8232	-18.1516	11.30424	河流沉积
宋和	3.243269	206.9248	-18.3915	11.75447	河流沉积
治沙站	3.038087	244.6358	-22.7737	11.05928	河流沉积
勤锋滩	11.27018	458.5144	-50.0603	10.0111	河流沉积
刘家地	2.346301	245.7138	-21.5277	12.59295	河流沉积
三角城	4.086655	254.084	-22.8754	13.29691	河流沉积
扶拱	1.710394	350.2823	-33.6047	11.38533	河流沉积
青土湖1	1.645367	295.3614	-26.7169	12.95729	河流沉积
青土湖2	-1.27886	185.949	-13.8453	12.04726	河流沉积

Spatial distribution characteristics of grain size of surface soil in the sand-resitant belt of Minqin Oasis marginal

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