Responses of biomass to the addition of water, nitrogen and phosphorus in Keerqin sandy grassland, Inner Mongolia, China

Yu, Zhan-Yuan; Zeng, De‐Hui; Jiang, Feihong; Zhao, Qiudong

doi:10.1007/s11676-009-0004-4

Cited by 23 publications

(21 citation statements)

References 15 publications

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“…The present study confirmed earlier observation that productivity of semi-arid, sandy grasslands in China is limited primarily by N (Chen et al 2006;Yu et al 2009). This study is the first to measure the effects of N addition on vegetation dynamics and below-and aboveground C pools in these grasslands.…”

Section: Discussionsupporting

confidence: 92%

Effects of nitrogen addition on vegetation and ecosystem carbon in a semi-arid grassland

Zeng

Fahey

et al. 2009

Biogeochemistry

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To clarify responses of plant and soil carbon (C) and nitrogen (N) pools in grassland ecosystem to N addition, a field experiment was performed in a grassland in Keerqin Sandy Lands, Northeast China. We investigated vegetation composition and C and N pools of plant and soil (0-30 cm) after five consecutive years of N addition at a rate of 20 g N m -2 y -1 . Vegetation composition and species diversity responded dramatically to N addition, as dominance by C 4 perennials was replaced with C 3 annuals. Carbon in aboveground pool increased significantly (over two-fold), mainly due to the increase of the C in aboveground living plants and surface litter, which increased by 98 and 134%, respectively. Although soil C did not change significantly, the root C pool decreased in response to 5 years of N addition. The total ecosystem C pool was not significantly impacted by N addition because the large soil pool did not respond to N addition, and the increase in aboveground C was offset by the decrease in root C pool. Moreover, N addition significantly increased the aboveground N pool, but had no significant effects on belowground and total ecosystem N pools. Our results suggest that in the mid-term N addition alters the C and N partitioning in above-and belowground pools, but has no significant effects on total ecosystem C and N pools in these N-limited grasslands.

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Section: Discussionsupporting

confidence: 92%

Effects of nitrogen addition on vegetation and ecosystem carbon in a semi-arid grassland

Zeng

Fahey

et al. 2009

Biogeochemistry

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“…In total, eight treatments were assigned randomly to the plots with ) consisted of two additions of total 10 g P 2 O 5 m -2 in the form of NaH 2 PO 4 and at the same time as N addition. Fertilizer was weighed, mixed with 16-l water in a sprayer, and applied to each of six randomly selected treatment plots (Yu et al 2009). …”

Section: Experimental Designmentioning

confidence: 99%

“…We measured vegetation responses to water and nutrient treatments in these seasonally dry grasslands on infertile sandy soil (Yu et al 2009). At the plant community scale, aboveground net primary productivity responded to all N treatments in this study but not to any of the treatments without added N (water and/or phosphorus treatments; Yu et al 2009). In this study, we examined the response of leaf morphology of a dominant annual herb, Chenopodium acuminatum Willd., to the interactive effects of water, N and P availability.…”

Section: Introductionmentioning

confidence: 99%

Response of leaf anatomy of Chenopodium acuminatum to soil resource availability in a semi-arid grassland

et al. 2010

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Soil water (W), nitrogen (N), and phosphorus (P) availability were manipulated for 2 years in a factorial experiment in a semi-arid grassland in the southeastern Keerqin Sandy Lands, China, to determine what soil resource(s) limits plant growth. We quantified the responses of leaf chemical and anatomical traits for the dominant annual herb Chenopodium acuminatum in this ecosystem to test hypotheses about leaf form and function in relation to soil resource limitation. Nitrogen was the principal limiting factor, and N treatments (alone and in combination with W and P) elicited consistent increases in leaf size and decreases in leaf thickness and water content. Differentiation in the leaf mesophyll between palisade and spongy parenchyma was lacking in N deficient plants and stimulated in all ?N treatments. The greater tissue density and cell packing may promote more efficient light capture with improved N nutrition. Mixed additions of W, N, and P were generally more advantageous to leaf expansion and nutrient balance than their isolated additions, therefore water and nutrients synchronous management would be a better approach to promote plant growth at the semi-arid region.

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“…The soil here has low fertility and N has been identified to be one of the major limiting factors for biomass and aboveground net primary productivity (Yu et al 2009). Such ecosystem is therefore likely to be highly sensitive to N input.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen loading levels affect abundance and composition of soil ammonia oxidizing prokaryotes in semiarid temperate grassland

et al. 2011

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Purpose Global nitrogen deposition has profound impact on the terrestrial ecosystem including the semiarid temperate grassland, causing vegetation community shifts and soil acidification. Little is known regarding the effect of nitrogen (N) deposition on the belowground microbial communities. This study aimed to examine the response of ammonia-oxidizing bacteria (AOB) and archaea (AOA) to added N in semiarid temperate grassland. Materials and methods We studied the changes of AOB and AOA by using molecular techniques targeting amoA genes along a urea fertilization gradient, i.e., 0, 1, 2, 4, 8, 16, 32, 64 g N m −2 year −1 , in a 6-year field experiment of semiarid temperate grassland, Inner Mongolia of China. Results and discussion AOB community responded to urea-N substrate clearly, and N addition rates 2-4 g N m −2 year −1 induced an increase in its abundances and the shift of its composition. However, AOA community remained unchanged and the highest N loading at 64 g N m −2 year −1 even decreased its abundance. Moreover, higher N loading rates (more than 16 g N m −2 year −1 ) significantly decreased the diversity of AOB but not AOA, as indicated by the decrease of its Shannon and Evenness indices. Conclusions The relative long-term nitrogen loading of more than 2-4 g N m −2 year −1 resulted in diversity loss of AOB in this semiarid temperate grassland. Increasing N loading altered AOB abundance and composition, but AOA showed nonsignificant changes.

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Responses of biomass to the addition of water, nitrogen and phosphorus in Keerqin sandy grassland, Inner Mongolia, China

Cited by 23 publications

References 15 publications

Effects of nitrogen addition on vegetation and ecosystem carbon in a semi-arid grassland

Effects of nitrogen addition on vegetation and ecosystem carbon in a semi-arid grassland

Response of leaf anatomy of Chenopodium acuminatum to soil resource availability in a semi-arid grassland

Nitrogen loading levels affect abundance and composition of soil ammonia oxidizing prokaryotes in semiarid temperate grassland

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