Soil Nutrients and Stoichiometric Characteristics of Xing'an Larch Forest in Different Age Groups

doi:10.13466/j.cnki.lyzygl.2021.03.020

Abstract

Abstract:

The dynamic changes of soil nutrient content and stoichiometric characteristics of Larch forest in different age groups in Greater Khinggan Mountains of Inner Mongolia were analyzed.The results showed as follows:1) Soil organic carbon (SOC) was significantly positively correlated with soil total nitrogen (TN),C:P ratio (C:P),N:P ratio (N:P);Soil TN was positively correlated with C:P,N:P.Soil ammonium nitrogen (${NH_{4}}^{+}$-N) was significantly positively correlated with soil nitrate nitrogen (${NO_{3}}^{-}$-N),C:P,N:P.Soil C:N and C:P were significantly positively correlated.The correlation between soil C:P and N:P was extremely significant.2) With the increase of stand age,soil SOC,TN and C:N,C:P,N:P showed a trend of increasing first and then decreasing,and reached the highest in the near mature stand.The content of total phosphorus (TP) in soil was firstly decreased and then increased,and the content of TP in middle aged forest was the lowest.There was no significant change in the contents of ammonium nitrogen and nitrate nitrogen in soil.The soil nutrient content decreased gradually.3) Soil bulk density decreased with the increase of stand age,and there was no significant difference in soil bulk density among all age groups.Soil TP had no significant correlation with soil bulk density,while soil SOC and TN had significant correlation with soil bulk density.

Key words: Larix gmelinii, age group, Carbon, Nitrogen and Phosphorus, stoichiometric characteristic, nutrient content

CLC Number:

S714.2

HAN Xiaorong, YANG Lin, MA Xiuzhi, LIANG Lei, LI Yiqian, LIANG Zhi. Soil Nutrients and Stoichiometric Characteristics of Xing'an Larch Forest in Different Age Groups[J]. FOREST RESOURCES WANAGEMENT, 2021, (3): 129-136.

Figures/Tables 8

Tab.1

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Tab.2

Correlation analysis of soil nutrients and their stoichiometric ratios

	SOC	TN	N $H 4 +$ -N	N $O 3 -$ -N	TP	C:N	C:P	N:P
SOC	1		0.514^*	0.248
TN	0.968^**	1	0.513^*	0.302
N $H 4 +$ -N			1
N $O 3 -$ -N			0.545^**	1
TP	0.215	0.224	-0.139	-0.090	1
C:N	0.471^*	0.242	0.174	-0.091	-0.067	1
C:P	0.892^**	0.861^**	0.605^**	0.309	-0.232	0.464^*	1
N:P	0.829^**	0.866^**	0.581^**	0.331	-0.270	0.218	0.961^**	1

Tab.2

Tab.3

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龄组	经纬度	海拔/m	平均年龄/a	平均树高/m	土壤pH值	土壤密度/(g/cm³)	土壤孔隙度/%
幼龄林	50°54'24″N,E121°30'4″	799	31	13.90	5.19	0.72	56.42
中龄林	50°54'20″N,E121°30'1″	825	77	18.10	4.97	0.91	53.08
近熟林	50°55'56″N,E121°30'0″	843	99	21.30	5.25	0.78	59.72
成熟林	50°54'49″N,E121°30'9″	838	121	22.50	5.28	0.88	55.63

养分含量及化学计量	回归方程	R²	P
SOC	Y=0.428x+87.498	0.173	0.012(P<0.05)
TP	Y=x⁰^.²¹¹+0.560	0.063	0.114(P>0.05)
TN	Y=1.395x+1.850	0.188	0.008(P<0.05)
C:N	Y=46.674x²-27.140x+2.476	0.152	0.178(P>0.05)
C:P	Y=-74.512x+146.96	0.285	0.007(P<0.05)
N:P	Y=-3.085x+3.312	0.338	0.003(P<0.05)