Temporal changes in precipitation altered aboveground biomass in a typical steppe in Nei Mongol, China

doi:10.17521/cjpe.2018.0230

Abstract

Abstract:

Aims Precipitation and its spatiotemporal changes are crucial for determining the effects of climate on plant community assembly and functioning of ecosystem (CAFE) in arid and semi-arid regions. Plant functional groups (PFGs) - an effective representation of CAFE—have been widely reported for their identity-dependent response to the changing climate. Here, we examine the responses of different PFGs to the temporal changes in precipitation by using aboveground biomass (AGB) as the dependent variable.
Methods We conducted a long-term ecological research of AGB since 1982 in a typical steppe grassland of Nei Mongol, China. We used the monthly-observation dataset from 1982 through 2015 to quantify the empirical relationships between AGB of different PDFs and precipitation.
Important findings We found that: 1) the decline in precipitation-concentration degree (PCD) was coupled with an increase in small rainfall events (≤5 mm) during the 35-year study period; 2) temporal changes in precipitation resulted in AGB decreases of annuals and biennials (AB), perennial forbs (PF) and perennial rhizome grass (PR), whereas AGB increased for perennial bunchgrasses (PB); 3) AGB, PF and semi-shrubs (SS) were positively correlated with growing season rainfall with AGB positively correlated with PCD while AGB of the shrubs (S) was negatively correlated with PCD; 4) AGB showed no significant correlation with precipitation frequency, but a significant negative correlation for type I to II precipitation 0.1-10 mm; 5) AGB had negative correlations with frequency and amount of type I (0.1-5.0 mm) and type VI (20-25 mm) precipitation. We concluded that the increase in small precipitation events will significantly reduce the AGB. These small precipitation events should be further explored for their ecological significances in the arid and semi-arid regions.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201907001

Key words: precipitation dynamics, precipitation-concentration degree, typical steppe, aboveground biomass, plant functional groups

MIAO Bai-Ling, LIANG Cun-Zhu, SHI Ya-Bo, LIANG Mao-Wei, LIU Zhong-Ling. Temporal changes in precipitation altered aboveground biomass in a typical steppe in Nei Mongol, China[J]. Chin J Plant Ecol, 2019, 43(7): 557-565.

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Figures/Tables 8

References 53

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功能群 Plant functional group	物种 Species
多年生根茎禾类草 Perennial rhizome grass	根茎冰草、黄囊薹草、羊草 Agropyron michnoi, Carex korshinskii, Leymus chinensis
多年生丛生禾草 Perennial bunchgrasses	糙隐子草、大针茅、渐尖早熟禾、阿尔泰溚草、羊茅、羽茅 Cleistogenes squarrosa, Stipa grandis, Poa attenuata, Koeleria macrantha, Festuca ovina, Achnatherum sibiricum
多年生杂类草 Perennial forbs	阿尔泰狗娃花、矮韭、细叶白头翁、瓣蕊唐松草、花苜蓿、柔毛蒿、串铃草、北芸香、多叶棘豆、二裂委陵菜、二色补血草、防风、甘草、狗舌草、黄花韭、火绒草、菊叶委陵菜、柳穿鱼、轮叶委陵菜、麻花头、红纹马先蒿、蓬子菜、披针叶野决明、乳白花黄耆、乳浆大戟、长柱沙参、山韭、伏毛山莓草、砂韭、费菜、细叶韭、细叶鸢尾、红柴胡、少花米口袋、达乌里芯芭、星毛委陵菜、宿根亚麻、野韭、直立黄芪、多裂叶荆芥、山蚂蚱草、女娄菜、翼茎风毛菊 Heteropappus altaicus, Allium anisopodium, Pulsatilla turczaninovii, Thalictrum petaloideum, Medicago ruthenica, Artemisia pubescens, Phlomis mongolica, Haplophyllum dauricum, Oxytropis myriophylla, Potentilla bifurca, Limonium bicolor, Saposhnikovia divaricata, Glycyrrhiza uralensis, Tephroseris kirilowii, Allium condensatum, Leontopodium leontopodioides, Potentilla tanacetifolia, Linaria vulgaris subsp. sinensis, Potentilla verticillaris, Klasea centauroides, Pedicularis striata, Galium verum, Thermopsis lanceolata, Astragalus galactites, Euphorbia esula, Adenophora stenanthina, Allium senescens, Sibbaldia adpressa, Allium bidentatum, phedimus aizoon, Allium tenuissimum, Iris tenuifolia, Bupleurum scorzonerifolium, Gueldenstaedtia verna, Cymbaria daurica, Potentilla acaulis, Linum perenne, Allium ramosum, Astragalus adsurgens, Nepeta multifida, Silene jenisseensis, Silene aprica, Saussurea japonica var. pteroclada
灌木 Shrubs	小叶锦鸡儿 Caragana microphylla
半灌木 Semi-shrubs	冷蒿、木地肤、燥原荠 Artemisia frigida, Kochia prostrata, Ptilotricum canescens
一二年生植物 Annuals and biennials	刺藜、大籽蒿、瓦松、鹤虱、猪毛蒿、藜、小花花旗杆、鳞叶龙胆、轴藜、猪毛菜 Dysphania aristata, Artemisia sieversiana, Orostachys fimbriatus, Lappula myosotis, Artemisia scoparia, Chenopodium album, Dontostemon micranthus, Gentiana squarrosa, Axyris amaranthoides, Salsola collina

功能群 Plant functional group	物种 Species
多年生根茎禾类草 Perennial rhizome grass	根茎冰草、黄囊薹草、羊草 Agropyron michnoi, Carex korshinskii, Leymus chinensis
多年生丛生禾草 Perennial bunchgrasses	糙隐子草、大针茅、渐尖早熟禾、阿尔泰溚草、羊茅、羽茅 Cleistogenes squarrosa, Stipa grandis, Poa attenuata, Koeleria macrantha, Festuca ovina, Achnatherum sibiricum
多年生杂类草 Perennial forbs	阿尔泰狗娃花、矮韭、细叶白头翁、瓣蕊唐松草、花苜蓿、柔毛蒿、串铃草、北芸香、多叶棘豆、二裂委陵菜、二色补血草、防风、甘草、狗舌草、黄花韭、火绒草、菊叶委陵菜、柳穿鱼、轮叶委陵菜、麻花头、红纹马先蒿、蓬子菜、披针叶野决明、乳白花黄耆、乳浆大戟、长柱沙参、山韭、伏毛山莓草、砂韭、费菜、细叶韭、细叶鸢尾、红柴胡、少花米口袋、达乌里芯芭、星毛委陵菜、宿根亚麻、野韭、直立黄芪、多裂叶荆芥、山蚂蚱草、女娄菜、翼茎风毛菊 Heteropappus altaicus, Allium anisopodium, Pulsatilla turczaninovii, Thalictrum petaloideum, Medicago ruthenica, Artemisia pubescens, Phlomis mongolica, Haplophyllum dauricum, Oxytropis myriophylla, Potentilla bifurca, Limonium bicolor, Saposhnikovia divaricata, Glycyrrhiza uralensis, Tephroseris kirilowii, Allium condensatum, Leontopodium leontopodioides, Potentilla tanacetifolia, Linaria vulgaris subsp. sinensis, Potentilla verticillaris, Klasea centauroides, Pedicularis striata, Galium verum, Thermopsis lanceolata, Astragalus galactites, Euphorbia esula, Adenophora stenanthina, Allium senescens, Sibbaldia adpressa, Allium bidentatum, phedimus aizoon, Allium tenuissimum, Iris tenuifolia, Bupleurum scorzonerifolium, Gueldenstaedtia verna, Cymbaria daurica, Potentilla acaulis, Linum perenne, Allium ramosum, Astragalus adsurgens, Nepeta multifida, Silene jenisseensis, Silene aprica, Saussurea japonica var. pteroclada
灌木 Shrubs	小叶锦鸡儿 Caragana microphylla
半灌木 Semi-shrubs	冷蒿、木地肤、燥原荠 Artemisia frigida, Kochia prostrata, Ptilotricum canescens
一二年生植物 Annuals and biennials	刺藜、大籽蒿、瓦松、鹤虱、猪毛蒿、藜、小花花旗杆、鳞叶龙胆、轴藜、猪毛菜 Dysphania aristata, Artemisia sieversiana, Orostachys fimbriatus, Lappula myosotis, Artemisia scoparia, Chenopodium album, Dontostemon micranthus, Gentiana squarrosa, Axyris amaranthoides, Salsola collina

地上生物量 Aboveground biomass (g·m^-2)	降水量 Precipitation (mm)		相对多度 Relative Abundance (%)
地上生物量 Aboveground biomass (g·m^-2)	年 Year	生长季 Growing season	多年生根茎禾类草 Perennial rhizome grass	多年生丛生禾草 Perennial bunchgrasses	多年生杂类草 Perennial forbs	一二年生植物 Annuals and biennials	灌木 Shrubs	半灌木 Semi-shrubs
195.8	330.8	287.9	63.4	19.3	9.9	4.8	1.9	0.7

地上生物量 Aboveground biomass (g·m^-2)	降水量 Precipitation (mm)		相对多度 Relative Abundance (%)
地上生物量 Aboveground biomass (g·m^-2)	年 Year	生长季 Growing season	多年生根茎禾类草 Perennial rhizome grass	多年生丛生禾草 Perennial bunchgrasses	多年生杂类草 Perennial forbs	一二年生植物 Annuals and biennials	灌木 Shrubs	半灌木 Semi-shrubs
195.8	330.8	287.9	63.4	19.3	9.9	4.8	1.9	0.7

编号 ID	日降水量 Daily precipitation (mm)	降水等级 Precipitation grade
I	0.1-5	小雨/小雪-中雪 Light rain/Light snow-Moderate snow
II	5-10	小雨/中雪-大雪 Light rain/Moderate snow-Heavy snow
III	10-15	中雨/暴雪 Moderate rain/Torrential snow
IV	15-20	中雨/暴雪 Moderate rain/Torrential snow
V	20-25	中雨/暴雪-大暴雪 Moderate rain/Torrential snow-Snowstorm
VI	25-30	大雨/大暴雪 Heavy rain/Snowstorm
VII	30-35	大雨/大暴雪 Heavy rain/Snowstorm
VIII	>35	大雨-暴雨/大暴雪-特大暴雪 Heavy rain-Torrential rain/Snowstorm- Historical extreme snow