呼伦贝尔沙地樟子松枯落物和土壤碳、氮、磷化学计量特征

doi:10.13866/j.azr.2024.08.09

Abstract

Abstract:

To reveal the characteristics of litter and soil C, N, and P stoichiometry and their main driving factors in the Hulunbuir Sandy Land. Different ages of Pinus sylvestris var. mongolica plantation forests and natural forests (medium-mature, near-mature, and mature forests) were used as research subjects to analyze the characteristics of litter and soil C, N, and P stoichiometry and their correlation with soil factors was explored. (1) The degree of decomposition significantly affected litter C, N, P, and the C:N ratio (P<0.05) and the soil layer significantly affected soil N and C:N and C:P ratios (P<0.05); however, the stand age of the forest and its interactions with the degree of decomposition and soil layer did not have a significant effect on litter and soil C, N, and P stoichiometric characteristics (P>0.05). There were significant differences (P<0.05) between natural and plantation forests in litter and soil relating to C and N contents and C:P and N:P ratios. (2) Litter C content was significantly and positively correlated with litter N and P content (P<0.05), and the litter C:P ratio was significantly and positively correlated with the C:N ratio (P<0.05); the soil C:P ratio was significantly and positively correlated with the soil N:P and C:N ratios (P<0.05). (3) The C, N, and P stoichiometric characteristics of litter were mainly significantly affected by pH, phosphatase, and urease (P<0.05), and the soil C, N and P stoichiometric characteristics were mainly significantly affected by pH, phosphatase, and convertase (P<0.05). The growth of P. sylvestris var. mongolica forest in the Hulunbuir Sandy Land may be limited by nitrogen, whereas the decomposition of litter may be limited by phosphorus; the main drivers of litter and soil C, N, and P stoichiometric characteristics were pH and phosphatase, respectively. This improved information is of great significance for guiding the management of P. sylvestris var. mongolica forests.

Key words: Pinus sylvestris var. mongolica, ecological stoichiometry, litter, soil, stand age, Hulunbuir Sandy Land

DONG Peng, REN Yue, GAO Guanglei, DING Guodong, ZHANG Ying. Stoichiometry of carbon, nitrogen, and phosphorus in the litter and soil of Pinus sylvestris var. mongolica in the Hulunbuir Sandy Land[J].Arid Zone Research, 2024, 41(8): 1354-1363.

Figures/Tables 9

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References 43

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样地	林龄/a	胸径/cm	树高/m	林分密度/（株·hm^-2）	郁闭度
天然林（NF）	10~60	23.69±3.87	10.12±0.73	-	0.83
中龄林（HBh）	29	12.86±1.32	16.96±2.57	1650	0.77
近熟林（HBn）	38	13.93±1.64	22.37±1.98	1650	0.86
成熟林（HBm）	47	14.29±1.58	25.51±2.15	1650	0.76

		半分解		分解
		F	P	F	P
枯落物	C	17.576	0.002	8.164	0.778
	N	10.85	0.024	7.397	0.171
	P	8.096	0.068	8.556	0.026
	C:N	6.243	0.243	9.463	0.067
	C:P	17.983	0.072	17.349	0.001
	N:P	6.997	0.521	8.008	0.088

		0~20 cm		20~40 cm
		F	P	F	P
土壤	C	17.972	0.029	6.52	0.004
	N	16.364	0.795	6.922	0.002
	P	5.604	0.411	6.248	0.236
	C:N	15.789	0.732	8.401	0.191
	C:P	8.837	0.011	15.776	<0.001
	N:P	6.498	0.004	7.187	0.007

		F（P）
		C	N	P	C:N	C:P	N:P
枯落物	林龄	0.416（0.870）	3.292（0.175）	4.635（0.175）	0.494（0.635）	15.650（0.026）	4.455（0.126）
	分解程度	166.630（<0.001）	4. 221（0.016）	5.959（0.01）	7.272（0.001）	1.367（0.277）	1.231（0.320）
	林龄×分解程度	1.67（0.193）	0.28（0.839）	0.09（0.966）	0.375（0.772）	0.17（0.916）	0.40（0.752）
土壤	林龄	0.366（0.721）	3.612（0.159）	32.990（0.009）	1.424（0.367）	3.435（0.168）	0.538（0.631）
	土层	2.720（0.067）	25.138（<0.001）	0. 188（0.903）	41.503（<0.001）	10.465（<0.001）	1.629（0.209）
	林龄×土层	4.89（0.007）	3.20（0.037）	0.344（0.794）	0.7（0.559）	1.83（0.162）	1.63（0.202）

	土壤因子	C	N	P	C:N	C:P	N:P
枯落物	SWC	-0.163	-0.24	-0.3	0.027	0.202	0.206
	NO₃^-	-0.233	0.013	-0.13	-0.274	0.006	0.194
	pH	-0.107	-0.505^**	-0.637^**	0.383^*	0.646^**	0.424^**
	AP	-0.02	-0.109	0.029	0.084	-0.035	-0.119
	INV	0.078	0.208	0.238	-0.102	-0.16	-0.109
	URE	0.488^**	0.3	0.350^*	0.276	0.049	-0.151
	PHO	0.639^**	0.515^**	0.362^*	0.256	0.138	-0.033
	PRO	0.362^*	0.192	0.251	0.247	0.027	-0.166
土壤	SWC	0.187	0.395^*	0.211	-0.098	-0.166	-0.155
	NO₃^-	-0.288	-0.228	0.142	0.187	-0.072	-0.174
	pH	0.071	-0.13	-0.163	0.447^**	0.259	-0.221
	AP	0.042	-0.083	-0.274	0.085	0.187	0.048
	INV	-0.213	-0.352^*	-0.116	0.097	0.176	0.246
	URE	0.132	0.212	-0.083	0.152	0.284	0.435^**
	PHO	0.273	0.446^**	0.073	0.111	0.352^*	0.527^**
	PRO	0.068	0.350^*	0.014	0.165	0.087	0.342^*

Stoichiometry of carbon, nitrogen, and phosphorus in the litter and soil of Pinus sylvestris var. mongolica in the Hulunbuir Sandy Land

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