平茬对天山北坡浅山带灌木群落生长及碳收支的影响

doi:10.13866/j.azr.2025.05.12

Abstract

Abstract:

This study aims to investigate the effects of stumping on the growth and carbon sequestration capacity of shrub communities in the low mountain belt on the northern slope of the Tianshan Mountains. Within the shrub communities of Berberis atrocarpa, Rosa platyacantha and Spiraea hypericifolia, four different stumping height treatments were set up: complete stumping (QP), leaving 1/2 of the original plant height (LG_1/2), leaving 1/4 of the original plant height (LG_1/4), and an un-coppiced control (CK). The growth indices of the shrub communities (ground diameter, crown width, dead branch ratio, and new branch length), carbon sequestration, and changes in soil microbial and enzyme activities were monitored. The results showed that: (1) The growth indices of the shrub communities were most responsive to the QP treatment, with new branch height increasing by 109.2% and the dead branch ratio decreasing by 88.1%, resulting in significant differences in the QP treatment. (2) The QP, LG_1/2, and LG_1/4 treatments increased the net ecosystem CO₂ exchange (NEE) of the shrub communities by 195.3%, 157.6%, and 177.4%, respectively, and decreased ecosystem respiration (ER) by 51.2%, 51.7%, and 66.5%, respectively, and soil respiration (RS) by 67.4%, 49.6%, and 12.2%, respectively. The carbon exchange of the shrub communities under the three stumping treatments showed significant differences compared with the control. (3) stumping significantly increased soil carbon content and enzyme activity in the shrub communities, and soil carbon exchange was significantly positively correlated with soil biotic factors (microbial biomass carbon, soil organic carbon, and soil enzyme activity). In conclusion, rational stumping measures can effectively enhance the growth and carbon sequestration capacity of shrub communities in the low mountain belt on the northern slope of the Tianshan Mountains. Complete stumping (QP) is the most effective in promoting shrub community growth and enhancing carbon sink function in this area, and it has a positive effect on mitigating the increase of CO₂ in the regional atmosphere.

Key words: carbon balance, flat stubble, shrub communities, net ecosystem, CO₂ exchange

LIU Xin, ZHANG Yutao, SHI Qingdong, LI Jimei, SUN Xuejiao. Effects of levelling stubble on the growth of shrub communities and carbon sequestration in the shallow mountain belt of the northern slope of Tianshan Mountains[J].Arid Zone Research, 2025, 42(5): 895-906.

Figures/Tables 12

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References 31

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平茬处理	群落组成	样地数量/个	灌木平均高度/m	灌木平均冠幅/m²	平均盖度/%	各样地平均株数/株
CK	Sh 7株；Rp 8株；Ba 5株	4	0.42±0.04	0.71×0.64	34.07±0.02	19
QP	Sh 8株；Rp 8株；Ba 4株	6	0.55±0.06	0.59×0.54	34.02±0.08	26
LG_1/2	Sh 4株；Rp 9株；Ba 7株	4	0.69±0.09	0.71×0.68	41.13±0.10	26
LG_1/4	Sh 5株；Rp 8株；Ba 7株	4	0.85±0.08	0.60×0.54	40.05±0.11	30

处理	同化箱内树种数量及组成	平均株高/m	平均冠幅/m²	平均盖度/%
CK	Sh 2株；Rp 1株；Ba 1株	0.38±0.14	0.35±0.07	43.10±0.07
QP	Sh 1株；Rp 1株；Ba 1株	0.42±0.06	0.32±0.06	45.06±0.06
LG_1/2	Sh 1株；Rp 1株；Ba 1株	0.50±0.17	0.37±0.15	47.06±0.05
LG_1/4	Sh 1株；Rp 1株；Ba 1株	0.65±0.26	0.32±0.09	50.03±0.11

物种	QP	LG_1/2	LG_1/4
宽刺蔷薇	116.7	5.0	50.0
金丝桃叶绣线菊	33.3	-33.3	-6.7
黑果小檗	50.0	2.5	-2.5

指标	处理	物种
指标	处理	宽刺蔷薇	金丝桃叶绣线菊	黑果小檗
新枝长/cm	CK	23.0	18.0	35.0
	QP	44.0	28.0	73.0
	LG_1/2	21.0	20.0	38.0
	LG_1/4	29.0	22.0	48.0
平茬处理与CK的新枝长度变化率/%	QP与CK	91.2	56.5	109.2
	LG_1/2与CK	-9.3	11.4	9.1
	LG_1/4与CK	26.4	22.1	37.1

指标	处理	物种
指标	处理	宽刺蔷薇	金丝桃叶绣线菊	黑果小檗
单株萌蘖枝条数/个	CK	3	12	5
	QP	10	28	21
	LG_1/2	5	16	13
	LG_1/4	8	18	16
平茬处理与CK的单株萌蘖枝条数变化率/%	QP与CK	233.1	133.2	323.0
	LG_1/2与CK	67.5	33.1	164.0
	LG_1/4与CK	167.3	50.3	224.0

Effects of levelling stubble on the growth of shrub communities and carbon sequestration in the shallow mountain belt of the northern slope of Tianshan Mountains

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平茬处理	土层深度 /cm	土壤有机碳 /（g·kg^-1）	土壤微生物量碳 /（mg·kg^-1）	脲酶 /[μg·（24h）^-1·g^-1]	超氧化物歧化酶 /（U·g^-1）	磷酸酶 /[μmol·（24h）^-1·g^-1]
CK	0~5	55.27±12.94	231.53±11.82	414.45±41.41	391.35±29.30	151.98±8.57
	5~10	42.60±5.32	192.63±45.39	351.52±66.13	314.03±83.91	105.48±22.06
	10~20	32.78±6.07	144.03±67.68	142.20±21.01	292.98±20.20	43.57±6.38
	20~40	24.61±3.23	120.35±56.55	106.37±1.24	386.52±34.32	40.31±11.50
QP	0~5	83.48±20.20	234.19±40.44	269.80±71.74	582.74±35.93	160.85±19.42
	5~10	59.81±11.66	237.52±52.75	266.60±53.60	642.53±86.23	131.95±43.55
	10~20	46.39±7.85	263.53±62.87	166.67±57.96	517.83±55.37	84.08±3.10
	20~40	40.43±4.60	304.77±74.14	178.62±36.06	521.14±65.67	52.31±12.91
LG_1/4	0~5 5~10 10~20 20~40	91.49±13.22 68.66±17.61 47.34±12.37 44.60±7.05	202.62±16.26 178.55±52.82 136.12±20.41 92.30±25.39	99.81±22.87 64.85±19.05 37.76±10.87 25.96±7.36	595.02±158.70 553.41±133.68 583.83±159.68 520.49±21.04	174.18±6.62 115.82±0.89 83.68±25.72 43.11±12.22
LG_1/2	0~5 5~10 10~20 20~40	88.43±11.84 56.97±7.17 35.41±2.83 37.03±7.02	211.14±8.71 229.16±20.41 200.02±57.39 165.33±17.29	349.34±52.66 294.86±58.32 235.72±56.56 194.64±59.61	491.81±26.64 472.25±48.15 388.04±77.31 418.56±88.58	159.58±15.38 118.56±35.37 89.44±21.12 82.89±16.21

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