黄土丘陵区退耕植被叶片-土壤生态化学计量特征与植物内稳态差异

doi:10.11707/j.1001-7488.LYKX20240365

Abstract

Abstract:

Objective: This study analyzed the leaf-soil ecological stoichiometric characteristics and plant homeostasis differences of typical revegetation in different arid areas of the Loess Hilly Region. From the perspective of plant nutrient utilization strategies and homeostasis maintenance ability, it aimed to identify suitable revegetation types for different arid levels. By analyzing the nutrient cycling processes driven by the ecological stoichiometric characteristics and plant homeostasis differences of typical revegetation in different arid areas, it provided a scientific basis for vegetation optimization and soil nutrient management in the Loess Hilly Region of China. Method: Along the aridity gradient from south to north of the Loess Plateau, 17-year-old Robinia pseudoacacia (RP) plantations, shrublands, and abandoned land were selected in Fuxian County (aridity level 0.641), Baota District (aridity level 0.718), and Mizhi County (aridity level 0.764) for the purpose of examining the carbon (C), nitrogen (N), and phosphorus (P) content and stoichiometric properties of both leaves and soils. The interrelationships between these components and the homeostatic characteristics within the leaves were further analyzed. Result: 1) The leaf carbon and nitrogen contents of RP plantations were respectively lower and higher than those of other vegetation restoration types. The leaf phosphorus content and soil carbon to nitrogen ratio of abandoned land were the highest, while the leaf soil carbon to phosphorus ratio and soil nitrogen to phosphorus ratio of shrubland were the highest. In terms of soil characteristics, soil carbon to nitrogen ratio, and soil carbon to phosphorus ratio of abandoned land were generally higher than those of other vegetation restoration types. Soil nitrogen content and soil nitrogen to phosphorus ratio were lowest in RP plantations. However, soil phosphorus content in RP plantations was significantly higher than that in shrublands and abandoned land. 2) With increasing aridity, the carbon and nitrogen contents of leaves in Baota District were respectively 8.77% and 6.64% lower than those in Fuxian County, while the phosphorus content was 34.25% higher. In Mizhi County, the carbon and nitrogen contents of leaves were respectively 1.01% and 44.53% lower than those in Fuxian County, while the phosphorus content was 16.02% higher. As aridity increases, the trends in the soil carbon to phosphorus and soil nitrogen to phosphorus ratio of leaves were similar to those of carbon and nitrogen, showing initial decreases followed by increases and overall declines, respectively. In contrast, the soil carbon to nitrogen ratio showed an increasing trend. 3) Soil carbon content (7.47, 3.44, and 2.67 g·kg^?1on average in Fuxian County, Baota District, and Mizhi County, sane blow), nitrogen content (averaging 0.66, 0.36, and 0.37 g·kg^?1), and the soil carbon to nitrogen ratio (averaging 11.62, 9.62, and 7.59), soil carbon to phosphorus ratio (averaging 14.89, 9.25, and 6.64), and soil nitrogen to phosphorus ratio (averaging 1.37, 0.99, and 0.92) all tended to decrease with increasing aridity. In contrast, soil phosphorus content (averaging 0.501, 0.36, and 0.40 g·kg^?1) first decreased and then increased. 4) An increase in aridity intensifies nitrogen limitation on vegetation growth, while the shift from abandoned land to forest land increases phosphorus limitation. Mantel analysis shows significant correlations between leaf and soil carbon, nitrogen, and phosphorus contents and their stoichiometric ratios at different levels. Aridity has a greater impact on leaf and soil indicators than vegetation type and soil depth. 5) Different revegetation types show distinct abilities to maintain foliar chemical stoichiometric homeostasis. Leaf carbon in all vegetation types exhibits absolute homeostasis. Leaf nitrogen and phosphorus in abandoned land and shrubland show weak homeostasis or sensitive characteristics. The soil carbon to phosphorus ratio of abandoned land leaves is sensitive or weakly homeostatic, while the soil carbon to nitrogen and soil nitrogen to phosphorus ratios of RP and shrub leaves are sensitive. Conclusion: Aridity is a key environmental factor regulating the leaf-soil carbon, nitrogen, and phosphorus stoichiometric characteristics of revegetation. RP plantations can more effectively maintain foliar homeostasis under different aridity levels in the Loess Hilly Region, showing stronger adaptability than shrublands and abandoned land, and can be the main tree species for vegetation restoration and reconstruction in this area. In areas with higher aridity and in abandoned land, nitrogen fertilizer should be applied, while in relatively humid shrublands and forests, nitrogen and phosphorus fertilizers should be added.

Key words: Loess Plateau, revegetation, ecological stoichiometry, homeostasis, aridity level

CLC Number:

S157

Chengwei Zhang,Xing Wang,Ke An,Zihao Wu,Jingyi Zhang,Zekun Zhong. Leaf-Soil Ecological Stoichiometric Characteristics and Plant Homeostasis Differences of Reclaimed Vegetation in the Loess Hilly Region[J]. Scientia Silvae Sinicae, 2025, 61(6): 61-74.

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研究区域 Study area	植被类型 Revegetation type	纬度 Latitude(N)	经度 Longitude(E)	海拔 Altitude/m	坡度 Slope/（°）	降雨量 Rainfall/mm	蒸散量 Evaporation/ mm	年均温 Annual temperature/℃
米脂县 Mizhi County	刺槐人工林 Robinia pseudoacacia plantation	37°45′37″	110°15′42″	1 056.0	15	418.1	1 771.5	8.5
	灌木林 Shrubland	37°51′33″	110°10′30″	1 088.0	25	418.1	1 771.5	8.5
	撂荒地 Abandoned land	37°48′43″	110°10′41″	1 013.0	0	418.1	1 771.5	8.5
宝塔区 Baota District	刺槐人工林 Robinia pseudoacacia plantation	36°39′17″	109°21′12″	1 262.5	25	456.1	1 618.2	9.9
	灌木林 Shrubland	36°39′33″	109°21′06″	1 262.0	23	456.1	1 618.2	9.9
	撂荒地 Abandoned land	36°18′25″	109°20′47″	1 190.2	15	456.1	1 618.2	9.9
富县 Fuxian County	刺槐人工林 Robinia pseudoacaciaplantation	35°05′35″	109°40′11″	1 201.6	14	532.7	1 484.1	9.5
	灌木林 Shrubland	35°13′34″	109°37′21″	1 288.6	0	532.7	1 484.1	9.5
	撂荒地 Abandoned land	35°06′05″	109°35′14″	1 103.3	0	532.7	1 484.1	9.5

研究区域 Study area	干旱度 Aridity index	植被类型 Revegetation type	叶片碳含量 Leaf carbon content/ （g·kg^?1）	叶片氮含量 Leaf nitrogen content/ （g·kg^?1）	叶片磷含量 Leaf phosphorus content/ （g·kg^?1）	叶片碳氮比 Leaf carbon to nitrogen ratio	叶片碳磷比 Leaf carbon to phosphorus ratio	叶片氮磷比 Leaf nitrogen to phosphorus ratio
米脂县 Mizhi County	0.764	刺槐人工林 Robinia pseudoacacia plantation	447.42±10.93Ab	18.18±0.90Ba	2.05±0.05Ab	24.70±1.02Ac	218.32±1.29Ab	8.88±0.43Ca
		灌木林 Shrubland	475.40±5.36Aa	14.68±0.45Cb	1.92±0.06Bb	32.43±0.81Ab	248.65±7.49Ba	7.66±0.07Cb
		撂荒地 Abandoned land	467.01±4.96Aab	9.52±0.27Cc	2.33±0.12Ba	49.17±1.75Aa	201.54±12.75Bb	4.09±0.13Bc
宝塔区 Baota District	0.718	刺槐人工林 Robinia pseudoacacia plantation	417.87±6.81Bb	31.00±0.89Aa	2.02±0.04Ac	13.50±0.44Bb	206.77±7.24Aa	15.33±0.45Aa
		灌木林 Shrubland	427.78±3.88Bab	26.93±0.66Bb	2.51±0.02Ab	15.90±0.24Bb	170.69±2.42Cb	10.75±0.31Bb
		撂荒地 Abandoned land	435.16±1.41Ba	13.41±0.90Bc	2.76±0.09Aa	32.73±2.09Ba	158.04±5.51Bb	4.85±0.22Bc
富县 Fuxian County	0.641	刺槐人工林 Robinia pseudoacacia plantation	449.68±5.27Ab	28.94±0.11Aa	2.06±0.02Aa	15.54±0.13Bb	218.07±4.21Ac	14.03±0.16Bb
		灌木林 Shrubland	480.07±5.85Aa	31.04±0.88Aa	1.52±0.01Cb	15.49±0.50Bb	315.89±3.27Aa	20.44±0.70Aa
		撂荒地 Abandoned land	474.21±2.92Aa	16.42±0.72Ab	1.86±0.12Ca	28.98±1.12Ba	257.68±17.85Ab	8.95±0.84Ac

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Leaf-Soil Ecological Stoichiometric Characteristics and Plant Homeostasis Differences of Reclaimed Vegetation in the Loess Hilly Region

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