Quantitative Characteristics and Influencing Factors of Regeneration Seedlings of Different Decay Grades of Pinus schrenkiana, Western Tianshan Mountains

doi:10.7525/j.issn.1673-5102.2024.02.013

Abstract

Abstract:

In order to explore the difference and influencing factors of the number of regenerated seedlings of Pinus schrenkiana on different decomposed grades of fallen wood， the relationship between the number and height levels of regenerated seedlings on different decomposed grades of fallen wood， and the water content， surface area， slope， slope direction and elevation of fallen wood were investigated respectively. The results showed that the probability of seedlings appearing on fallen wood with different decay grades was different， but the seedlings survival rate increased with the increase the decay grade of fallen wood. The height level structure of fallen wood seedlings with different decomposition grades showed obvious growth characteristics， with seedlings at height of 0-5 cm being the most. The water content of fallen wood had a significant impact on the number of seedlings on grade Ⅰ and grade Ⅱ decayed fallen wood（P<0.05）， while the surface area of fallen wood had a significant impact on the number of seedlings on grade Ⅱ， Ⅲ and Ⅳ decayed fallen wood（P<0.01）， but the slope and altitude had no significant impact on the number of regenerated seedlings on each grade of decayed fallen wood（P<0.05）. Further analysis of the influencing factors on the number of seedlings at different height levels showed that water content had a very significant impact on the number of A₁（0-5 cm） and A₂（5.1-10.0 cm） height level regenerated seedlings on fallen wood with grade Ⅱ decay（P<0.01）， and the surface area of fallen wood had a significant impact on the number of A₁ height level seedlings on fallen wood with grade Ⅱ and Ⅲ decay（P<0.05）； On the fallen wood with grade Ⅳ decay， these factors had no significant impact on the number of regenerated seedlings at different height grades（P<0.05）. The surface area and slope direction of fallen trees had a significant impact on the number of dead seedlings on fallen trees. The water content on low-level decomposed fallen wood was the main factor affecting the number of regenerated seedlings， while for high-grade fallen wood， the surface area was the main factor. In contrast， seedlings with lower heights were more susceptible to the impact.

Key words: Pinus schrenkiana, fallen wood, decomposition grade, regeneration, seedling

CLC Number:

Q948.12

Jiongkun HE, Zhenwei XU, Rukang SHI, Dayong HAN. Quantitative Characteristics and Influencing Factors of Regeneration Seedlings of Different Decay Grades of Pinus schrenkiana, Western Tianshan Mountains[J]. Bulletin of Botanical Research, 2024, 44(2): 279-288.

Figures/Tables 7

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腐解等级 Decomposi- tion grade	幼苗总数量/株 Total number of seedlings	数量占比 Quantity/%	存活幼苗数量/株 Number of surviv- ing seedlings	数量占比 Quantity/%	死亡幼苗数量/株 Number of dead seedlings	数量占比 Quantity/%	死亡率 Death rate/%	倒木数量/株 Quantity of fallen wood	出现幼苗的倒木数量 Number of fallen trees with seedlings	频率 Frequency/%	倒木上幼苗密度/（株·m^-2） Seedling density on fallen wood
Ⅰ	7	0.35	5	0.27	2	1.63	28.57	67	2	2.99	0.402
Ⅱ	277	13.85	256	13.64	21	17.07	7.58	146	24	16.44	2.518
Ⅲ	1 257	62.85	1 172	62.44	85	69.11	6.76	136	71	52.21	4.005
Ⅳ	446	22.30	431	22.96	15	12.19	3.36	60	22	36.67	6.746
Ⅴ	13	0.65	13	0.69	0	0	0	40	4	10.00	1.415

腐解等级 Decomposition grade	回归方程系数Coefficient of regression equation
腐解等级 Decomposition grade	常量 Constant	含水量 Water content	倒木表面积 Surface area of fallen wood	坡向 Slope aspect	坡度 Falling gradient	海拔 Altitude
Ⅰ级 Grade Ⅰ	21.327	0.065*	0.035	0.001	-0.028	-0.013
Ⅱ级 Grade Ⅱ	-13.095	0.719**	0.729**	0.023	-0.134	0.003
Ⅲ级 Grade Ⅲ	-15.101	0.039	1.924**	0.062*	0.2	-0.001
Ⅳ级 Grade Ⅳ	97.324	-0.003	4.365**	0.035	-0.281	-0.063
Ⅴ级 Grade Ⅴ	-18.774	0.035	0.077	-0.005	0.032	0.011

腐解等级 Decomposition grade	高度等级 Height level	回归方程系数Coefficient of regression equation
腐解等级 Decomposition grade	高度等级 Height level	常数 Constant	含水量 Water content	倒木表面积 Surface area of fallen wood	坡向 Slope aspect	坡度 Falling gradient	海拔 Altitude
Ⅱ级 Grade Ⅱ	A₁	-10.170	1.709*	0.947*	0.090	0.343	-0.170
	A₂	101.199	0.906*	0.375	0.015	0.093	-0.700
	A₃	5.198	0.114	0.034	0.001	0.014	-0.004
	A₄	15.350	0.003	-0.008	-0.003	-0.012	-0.009
Ⅲ级 Grade Ⅲ	A₁	-52.966	0.101	0.780*	0.039	0.208	0.028
	A₂	-69.132	-0.050	0.204	0.025	0.100	0.041
	A₃	-13.715	-0.019	0.031	0.009*	0.020	0.008
	A₄	-2.874	-0.003	0.013	0.002	0.003	0.002
Ⅳ级 Grade Ⅳ	A₁	1 168.433	1.362	-0.010	0.109	-0.970	-0.715
	A₂	681.802	0.469	-0.249	0.047	-0.738	-0.409
	A₃	107.015	0.061	-0.031	0.007	-0.124	-0.064
	A₄	29.019	0.022	-0.018	0.002	-0.042	-0.017

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