Biomass allocation and nutrient dynamics in plant communities of Napahai wet and swamp meadows

doi:10.13466/j.cnki.lczyyj.2025.01.006

Abstract

Abstract:

Wet meadows and swamp grasslands of Napahai Lake in the northwestern plateau of Yunnan were examined to assess the impact of short-term grazing exclusion on biomass allocation and soil physicochemical properties.Field sampling and laboratory experiments were conducted,and one-way ANOVA was used to compare the differences in biomass allocation characteristics and soil properties between the two grasslands.Redundancy analysis,Monte Carlo tests,and Pearson correlation analysis were employed to explore the relationship between soil physicochemical properties and biomass allocation.The results indicate that:1)There is a highly significant difference(P=0.001)in biomass allocation between swamp grasslands and wet meadows,with swamp grasslands having significantly higher belowground biomass(BGB)and total biomass(TB),and root-to-shoot ratio(R/S),compared to wet meadows(P<0.05),while aboveground biomass(AGB)showed no significant difference.2)Soil total carbon(TC),total organic carbon(TOC),inorganic carbon(IC),ammonium nitrogen(AN),electrical conductivity(EC),and soil volumetric water content(SVWC)were significantly higher in swamp grasslands(P<0.05),where as soil pH and available potassium(AK)were significantly lower(P<0.05),with no significant differences in soil total nitrogen(TN),total phosphorus(TP),total potassium(TK),and available phosphorus(AP).3)Soil TC was significantly positively correlated with BGB and TB(P<0.05),soil TK with AGB(P<0.05),and soil AK with BGB and TB negatively correlated(P<0.05).These findings reveal significant differences in biomass allocation between Napahai Lake wet meadows and swamp grasslands,with TC,TK and AK being closely correlated with biomass allocation characteristics.

Key words: Napahai, wet meadow, swamp meadow, biomass allocation, soil physicochemical properties

CLC Number:

Q145.2

BI Xiaoting, YANG Junheng, CUI Haijun, SONG Weifeng, ZHAO Xuyan, WANG Tingting, PU Jingyuan, YUAN Suyao. Biomass allocation and nutrient dynamics in plant communities of Napahai wet and swamp meadows[J]. Forest and Grassland Resources Research, 2025, (1): 48-57.

Figures/Tables 6

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指标	RDA1	RDA2	R²	P
pH值	-0.917	0.399	0.057	0.322
总碳(TC)	0.988	-0.156	0.127	0.073
总有机碳(TOC)	0.986	0.170	0.071	0.249
无机碳(IC)	0.922	-0.388	0.089	0.160
总氮(TN)	-0.924	0.383	0.012	0.774
总磷(TP)	-0.091	0.996	0.000	0.987
总钾(TK)	-0.159	0.987	0.142	0.047
碱解氮(AN)	0.855	-0.519	0.060	0.326
有效磷(AP)	0.950	-0.312	0.102	0.102
速效钾(AK)	-0.977	0.215	0.131	0.068
电导率(EC)	0.751	0.660	0.023	0.629
体积含水量(SVWC)	0.859	0.512	0.023	0.633