Soil moisture variation characteristics of Picea crassifolia forestry in Pailugou Watershed of Qilian Mountains

doi:10.7522/j.issn.1000-694X.2020.00017

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (5): 142-148.DOI: 10.7522/j.issn.1000-694X.2020.00017

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Soil moisture variation characteristics of Picea crassifolia forestry in Pailugou Watershed of Qilian Mountains

Qian Lu¹(), Yi Li¹(), Xiande Liu¹^,², Weijun Zhao²

^1.College of Forestry，Gansu Agricultural University，Lanzhou 730070，China
^2.Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province，Zhangye 734000，Gansu，China

Received:2020-03-03 Revised:2020-03-30 Online:2020-09-28 Published:2020-09-28
Contact: Yi Li

Abstract

Abstract:

Soil moisture is the key source for plant growth and plays an important role in ecosystem dynamics. This study selected Picea crassifolia forest with different elevation gradients in Pailugou catchment of Qilian Mountains as the research objects， and the soil moisture content was monitored by stratification during the two consecutive growing seasons （0-10， 10-20， 20-30， 30-40， 40-50， 50-60 cm） by establishing fixed plots. The results showed that：（1）During the samples of Picea crassifolia forest，there is a great difference in soil moisture content， which is shown as the following elevation gradient： soil moisture at 3 300 m>3 100 m>2 900 m>2 700 m>2 500 m. （2） Both soil moisture content and the coefficient of variation （CV） were decreased with the increase of soil depth at different elevation gradients. In the range of 0~10 cm soil layer， the CV of soil moisture content is the highest. The order of variation coefficient of soil moisture content in the same soil layer is basically in order of elevation CV at 2 500 m>2 700 m>2 900 m>3 100 m>3 300 m. （3）On the spatial scale of small watershed， elevation， precipitation， temperature， and soil characteristics affect the differentiation of soil moisture content， which makes the spatial distribution of soil moisture content increase with elevation， and therefore the vegetation change.

Key words: Qilian Mountains, Picea crassifolia, soil moisture, coefficient of variation

CLC Number:

S153

Qian Lu, Yi Li, Xiande Liu, Weijun Zhao. Soil moisture variation characteristics of Picea crassifolia forestry in Pailugou Watershed of Qilian Mountains[J]. Journal of Desert Research, 2020, 40(5): 142-148.

Figures/Tables 7

References 25

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样地号	海拔 /m	样地坐标	坡向 /(°)	坡度 /(°)	郁闭度	平均高度 /m	平均胸径 /cm	活地被层（草、苔藓、地衣）覆盖度/%
A1,B1,C1	2 500	38°34′49″N,100°17′49″E	20,24,24	22	0.68	5.8	10.9	20,20,20
A2,B2,C2	2 700	38°33′29″N,100°17′49″ E	30,35,35	20	0.64	8.8	15.8	20,20,20
A3,B3,C3	2 900	38°32′47″N,100°18′04″E	350,350,350	18	0.70	8.2	15.1	30,30,30
A4,B4,C4	3 100	38°32′32″N,100°18′13″E	22,20,20	18	0.60	6.9	14.0	60,80,85
A5,B5,C5	3 300	38°32′09″N,100°18′15″E	350,350,350	28	0.20	4.4	11.9	70,85,95

样地号	海拔 /m	样地坐标	坡向 /(°)	坡度 /(°)	郁闭度	平均高度 /m	平均胸径 /cm	活地被层（草、苔藓、地衣）覆盖度/%
A1,B1,C1	2 500	38°34′49″N,100°17′49″E	20,24,24	22	0.68	5.8	10.9	20,20,20
A2,B2,C2	2 700	38°33′29″N,100°17′49″ E	30,35,35	20	0.64	8.8	15.8	20,20,20
A3,B3,C3	2 900	38°32′47″N,100°18′04″E	350,350,350	18	0.70	8.2	15.1	30,30,30
A4,B4,C4	3 100	38°32′32″N,100°18′13″E	22,20,20	18	0.60	6.9	14.0	60,80,85
A5,B5,C5	3 300	38°32′09″N,100°18′15″E	350,350,350	28	0.20	4.4	11.9	70,85,95

年份	土层深度 /cm	海拔/m
年份	土层深度 /cm	2 500	2 700	2 900	3 100	3 300
2016	0~10	38.87±16.93^aA	49.46±15.27^aA	81.17±16.61^aB	90.73±20.44^aB	112.21±22.87^aC
	10~20	27.00±10.20^bA	36.35±18.70^bA	70.70±21.75^aB	91.47±14.98^aC	103.77±22.67^aD
	20~30	23.83±8.83^bA	30.75±12.3^bA	72.58±11.51^aB	91.21±16.18^aC	94.06±19.4^aC
	30~40	23.35±7.00^bA	30.28±10.98^bA	67.91±10.39^bB	86.87±17.84^aC	88.02±20.60^bC
	40~50	20.56±10.40^bA	27.75±5.99^bB	61.42±7.27^bC	78.15±14.80^bD	86.06±21.4^bD
	50~60	18.30±5.25^bA	26.7±4.78^bB	54.83±6.04^bC	70.27±6.00^bD	83.85±12.96^bE
2017	0~10	37.06±17.87^aA	46.87±22.22^aA	99.79±20.62^aB	101.60±22.41^aB	121.43±17.23^aC
	10~20	28.12±12.68^bA	34.68±14.50^bA	84.10±17.06^aB	94.39±17.78^aC	107.35±18.44^aD
	20~30	25.72±10.12^bA	27.92±9.92^bA	78.54±10.80^aB	91.21±17.42^aC	97.14±29.99^aC
	30~40	23.73±7.51^bA	28.15±9.23^bA	69.89±8.20^bB	73.29±19.87^bC	77.54±25.78^bC
	40~50	23.04±6.82^bA	29.54±5.94^bB	65.53±8.19^bC	79.09±13.72^bD	85.24±25.60^bD
	50~60	25.13±7.05^bA	29.48±5.33^bB	65.45±7.66^bC	75.76±15.52^bD	86.72±14.73^bE

年份	土层深度 /cm	海拔/m
年份	土层深度 /cm	2 500	2 700	2 900	3 100	3 300
2016	0~10	38.87±16.93^aA	49.46±15.27^aA	81.17±16.61^aB	90.73±20.44^aB	112.21±22.87^aC
	10~20	27.00±10.20^bA	36.35±18.70^bA	70.70±21.75^aB	91.47±14.98^aC	103.77±22.67^aD
	20~30	23.83±8.83^bA	30.75±12.3^bA	72.58±11.51^aB	91.21±16.18^aC	94.06±19.4^aC
	30~40	23.35±7.00^bA	30.28±10.98^bA	67.91±10.39^bB	86.87±17.84^aC	88.02±20.60^bC
	40~50	20.56±10.40^bA	27.75±5.99^bB	61.42±7.27^bC	78.15±14.80^bD	86.06±21.4^bD
	50~60	18.30±5.25^bA	26.7±4.78^bB	54.83±6.04^bC	70.27±6.00^bD	83.85±12.96^bE
2017	0~10	37.06±17.87^aA	46.87±22.22^aA	99.79±20.62^aB	101.60±22.41^aB	121.43±17.23^aC
	10~20	28.12±12.68^bA	34.68±14.50^bA	84.10±17.06^aB	94.39±17.78^aC	107.35±18.44^aD
	20~30	25.72±10.12^bA	27.92±9.92^bA	78.54±10.80^aB	91.21±17.42^aC	97.14±29.99^aC
	30~40	23.73±7.51^bA	28.15±9.23^bA	69.89±8.20^bB	73.29±19.87^bC	77.54±25.78^bC
	40~50	23.04±6.82^bA	29.54±5.94^bB	65.53±8.19^bC	79.09±13.72^bD	85.24±25.60^bD
	50~60	25.13±7.05^bA	29.48±5.33^bB	65.45±7.66^bC	75.76±15.52^bD	86.72±14.73^bE

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Soil moisture variation characteristics of Picea crassifolia forestry in Pailugou Watershed of Qilian Mountains

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