不同坡向雪岭云杉天然更新影响因素分析

doi:10.13866/j.azr.2023.10.12

Abstract

Abstract:

The influence of different slope-facing environmental factors on the natural regeneration of Picea schrenkiana in the middle section of the northern slope of Tianshan Mountains was investigated. A series of plots were established on shady, semishady, semisunny, and sunny slopes at the same altitude, in a Picea schrenkiana forest to develop the structure equation model for the regeneration index which uses different slope-facing environmental factors. According to the environmental characteristics of the different slope-facings, the relationship between the survival status of Picea schrenkiana seedlings and environmental factors was analyzed. The results showed that the semishady and semisunny slopes were more suitable for the survival and growth of seedlings, and the regeneration indexes of the two slopes (0.065 and 0.057) were significantly higher than those of the shady and sunny slopes. Litter was found to have a dual effect on the regeneration of Picea schrenkiana. The undecomposed litter layer was too thick to be beneficial to regeneration, while the rich organic matter could promote the formation of a high nitrogen environment in the soil, which was conducive to the regeneration of seedlings. The influence of different slope-facing environmental factors on the regeneration index was in the order of total nitrogen content (0.60) > adult tree density (0.46) > litter half-decomposed layer (0.37) > total potassium content (0.24) > organic matter content (0.23) > total phosphorus content (-0.16) > available phosphorus content (-0.32) > litter undecomposed layer thickness (-0.34). Overall, the regeneration of Picea schrenkiana seedlings in the region was best on the semishady and semisunny slopes with a closure degree of approximately 0.6 and litter thickness of approximately 2.5 cm, as well as high total nitrogen and total potassium contents in the soil.

Key words: Picea schrenkiana, natural regeneration, slope, environmental factors, structural equation model, northern slope of Tianshan Mountains

WANG Guanzheng, CHANG Shunli, WANG Jianping, ZHANG Yutao, SUN Xuejiao, LI Xiang. Factors affecting Picea schrenkiana regeneration on different slope directions[J].Arid Zone Research, 2023, 40(10): 1661-1669.

Figures/Tables 7

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References 26

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坡向	平均海拔 /m	平均坡度 /(°)	成年树数量	幼树数量	幼苗数量	平均树高 /m	平均胸径 /cm	草本植物盖度 /%
阴坡	2156	22	365	521	418	4.48±3.0	6.22±3.0	36.2±6.3
半阴坡	2202	28	518	1320	594	5.44±2.0	6.93±1.9	25.5±8.2
半阳坡	2210	19	439	743	668	3.84±2.4	5.25±3.2	18.1±8.7
阳坡	2185	25	425	410	360	6.08±3.8	8.7±5.2	9.6±6.5

坡向	分布情况	生长情况	年龄结构	更新指数
阴坡	0.168±0.060b	0.368±0.057a	0.0784±0.005b	0.029±0.003b
半阴坡	0.291±0.068a	0.483±0.053a	0.249±0.062a	0.065±0.012a
半阳坡	0.360±0.078a	0.310±0.069b	0.187±0.058a	0.057±0.009a
阳坡	0.152±0.053b	0.344±0.060a	0.066±0.044b	0.026±0.010b
信息熵	0.904	0.9561	0.8761
变异系数	0.096	0.0439	0.1239
权重/%	36.40	16.65	46.96

土壤理化性质指标	阴坡	半阴坡	半阳坡	阳坡
NI/（mg·kg^-1）	0.07±0.01a	0.03±0.01b	0.03±0.01b	0.03±0.01b
OR/（g·kg^-1）	71.11±9.67b	97.42±13.40a	94±10.20a	68.51±11.30b
TN/（g·kg^-1）	3.17±1.37b	5.33±1.62a	5.08±1.28a	2.10±0.52b
TP/（g·kg^-1）	0.71±0.18ab	0.56±0.229b	0.60±0.30b	0.83±0.13a
TK/（g·kg^-1）	24.20±2.42a	25.41±1.72a	26.50±2.22a	24.40±3.26a
AN/（mg·kg^-1）	336±137a	276±97.60a	293±79.50a	343±93.91a
AP/（mg·kg^-1）	7.77±1.36b	6.46±1.86bc	5.91±1.56c	10.10±1.10a
AK/（mg·kg^-1）	237±48a	174±28.52b	155±30.30b	266±43a
SK/（g·kg^-1）	1560±111a	1280±189b	1130±183bc	1080±155c

因子	直接影响	间接影响	总影响
LT	-0.34	0	-0.34
NT	0.24	0.22	0.46
OR	-0.45	0.69	0.23
TN	0.69	0	0.60
TP	-0.16	0	-0.16
TK	0.24	0	0.24
AP	0.16	-0.48	-0.32
MT	0.14	0.23	0.37

Factors affecting Picea schrenkiana regeneration on different slope directions

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