Habitat Characteristics and Effects on Growth of Arundinaria faberi in Different Slope Positions of Subalpine Meadow

doi:10.13466/j.cnki.lyzygl.2023.02.010

Abstract

Abstract:

As a dominant plant species in subalpine meadows on the low-latitude plateau,it is of great guiding significance to clarify the habitat characteristics and key growth factors of different slope positions of Arundinaria faberi for its community protection.The research object was Arundinaria faberi in the subalpine meadow of Gaoben Mountain in Xundian,Yunnan.By investigating the characteristics of growth and habitat factors of Arundinaria faberi in different slope positions,the key growth factors of Arundinaria faberi were identified by correlation heat map.The results showed that:1) The air temperature and relative humidity tended to decrease with the increase of the slope position,while the wind speed and solar radiation intensity increased with the increase of the slope position.2) The soil particle composition of different slope positions was mainly composed of silt particles.The soil bulk density increased with the increase of the slope position.The soil moisture content,large aggregate content and soil chemical indicators all increased first and then decreased with the increase of the slope position.The meadow soil was obviously acidic,and the soil quality level reflected by the physical and chemical characteristics of the middle slope soil was relatively higher.3) With the increase of the slope position,the morphology and community characteristics of Arundinaria faberi showed a significant deterioration trend.4) Correlation heat map analysis showed that air temperature,solar radiation intensity,wind speed,soil bulk density and available phosphorus had a great influence on the corresponding growth characteristics of Arundinaria faberi among which air temperature,solar radiation intensity,wind speed and soil bulk density were the most influential key factor for growth.

Key words: subalpine meadow, Arundinaria faberi, slope position, environmental factors, growth effects

CLC Number:

YAN Keyu, CHEN Pingping, LI Jianxing, ZHANG Limei, LIU Hui, CHEN Zhengfa. Habitat Characteristics and Effects on Growth of Arundinaria faberi in Different Slope Positions of Subalpine Meadow[J]. FOREST RESOURCES WANAGEMENT, 2023, (2): 70-78.

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采样区域编号	坡位	海拔/m	经纬度	平均坡度/(°)	土壤采样点数/个
J1	上坡位	3129~3134	25°50'50″N,103°11'18″E	17.82	8
J2	中坡位	3100~3105	25°50'52″N,103°11'14″E	17.87	5
J3	下坡位	3081~3085	25°50'53″N,103°11'11″E	17.45	6

坡位	空气温度/ ℃	空气相对湿度/%	风速/ (m/s)	太阳辐射强度/(MJ/m²)
上坡位	14.9	69.9	9.5	4450.3
中坡位	15.1	70.1	8.3	4441.9
下坡位	15.2	70.2	7.6	4434.6

土壤团聚体类别	坡位	不同团聚体粒径分级所占百分比/%
土壤团聚体类别	坡位	>10 mm	>5~10 mm	>2~5 mm	>1~2 mm	>0.5~1 mm	>0.25~0.5 mm	≤0.25 mm
	下坡位	0.00	1.11	8.94	8.94	28.26	28.22	24.53
机械稳定性团聚体	中坡位	7.69	15.37	9.23	9.23	24.63	17.04	16.81
	上坡位	5.22	11.93	21.05	8.17	17.67	18.34	17.62
	下坡位	0.00	1.46	14.07	8.34	17.82	19.14	39.17
水稳性团聚体	中坡位	5.61	15.57	20.26	7.73	16.26	9.85	24.72
	上坡位	6.21	11.57	18.82	8.54	11.60	12.17	31.09

坡位	冷箭竹植株形态特征参数均值
坡位	株高/m	地径/mm	鞭根直径/mm	须根数/根
上坡位	0.15	5.10	4.32	6
中坡位	0.65	10.04	6.08	8
下坡位	2.10	10.20	7.63	14