Carbon and Nitrogen Losses from Soil Depend on Degradation of Tibetan <i>Kobresia</i> Pastures

Liu, Shibin; Schleuß, Per-Marten; Kuzyakov, Yakov

doi:10.1002/ldr.2522

Cited by 51 publications

(26 citation statements)

References 69 publications

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“…Therefore, optimal N fertilizer for grain yield might be 300 kg ha −1 (Khaliq, 2008) with optimal irrigation water. Consequently, the application of higher doses of N with frequent water availability increases N leaching and has negative impacts on soil plant ecosystems (Liu, Schleuss, & Kuzyakov, 2017).…”

Section: Significant Interaction Between I and F Treatments Was Obsermentioning

confidence: 99%

Offsetting land degradation through nitrogen and water management during maize cultivation under arid conditions

et al. 2018

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The best management of soil, irrigation, and crop nutrients is among major components of sustainable agriculture that reduces groundwater contamination, prevents soil degradation, and guarantees the best resource use efficiency. Trials were conducted to optimize maize (Zea mays L.) yield by experimenting various irrigation water regimes, nitrogen (N) application rates, and methods in 96 pots under arid environmental conditions during autumn 2012. Crop hydrological and agronomic characteristics were assessed under a completely randomized design with factorial arrangements. Water and N stress to the plants under observation significantly reduced the water potential, osmotic potential, and turgor pressure of the leaves. Crop growth rate and total dry matter production were significantly improved by an increase in N fertilizer application up to 300 kg ha−1 (equivalent to 4.8 g N pot−1) for all water regimes. Grain per cob, 1,000‐grain weight, and final grain yield were higher at 100% field capacity with the application of 300 kg N ha−1 under the soil N application method than those under foliar N application treatments. The best N rate for optimum grain production was attained by 300 kg ha−1 with 575‐mm supplemental irrigation water ha−1. The quadratic equation fitting revealed that the effect of N on crop growth parameters was higher than that of the supplemental irrigation; therefore, a water deficit may partly be managed by adding N to the soil. These water and N managements may be used in formulating agricultural practices to avoid degradation of lands for soil and environmental conditions similar to those of the current study warranting a field research.

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Section: Significant Interaction Between I and F Treatments Was Obsermentioning

confidence: 99%

Offsetting land degradation through nitrogen and water management during maize cultivation under arid conditions

et al. 2018

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“…These long-term degradation processes gradually shift the Kobresia pastures to dead root mats with lower C and N contents, microbial biomass and root biomass. Thus, the three root mat varieties sampled in our study represent the degradation continuum of Kobresia pastures (living < dying < dead, Liu et al, 2016).…”

Section: Sampling Preparation and Experimental Set-upmentioning

confidence: 99%

“…Six samples were randomly picked out from each root mat type and transferred to incubation boxes (Liu et al, 2016). The experiment was conducted at a constant temperature (20°C), which is in the range of daily mean temperatures during the growing season in Nagqu (9·3-21·3°C, Geng et al, 2012).…”

Section: Sampling Preparation and Experimental Set-upmentioning

confidence: 99%

Responses of Degraded Tibetan Kobresia Pastures to N Addition

2017

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Kobresia pastures on the Tibetan Plateau are the largest alpine pastoral ecosystems. Kobresia pastures have experienced severe degradation in recent decades, inducing large nitrogen (N) losses from these ecosystems. This is particularly problematic, as it intensifies prevailing N limitation in these regions. Simultaneously, anthropogenic N deposition has increased across these ecosystems, but the fate of added N on variously degraded Kobresia pastures remains unclear. Kobresia pastures of three degradation stages were investigated: living, dying and dead root mats. High and very low (as a tracer) amounts of 15N‐labelled ammonium nitrate (NH4NO3) were applied to root mats under controlled conditions. Leaching was simulated over 3 months, and 15N recovery was measured in the plant–soil system. N addition promoted aboveground biomass and foliar N content of Kobresia during the early growth period, indicating a short‐term offset of N limitation. After 7–8 weeks, plant growth and 15N uptake were reduced in plants with initial N addition, reflecting a transition to N limitation induced by N uptake and leaching from soil. This limitation was also indicated by the strong decline of NO3− in leachates from living root mats compared with degraded root mats. Leaching N losses from dying and dead root mats increased 2⋅2 and 6⋅3 times, respectively, compared with those of living root mats. We conclude that N addition can facilitate plant growth in living root mats but contributes to N leaching in degraded pastures. This contribution to N leaching may weaken ecosystem recovery, increase NO3− loading of adjacent lower landscape parts and cause eutrophication of aquatic ecosystems. Copyright © 2017 John Wiley & Sons, Ltd.

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“…According to some authors [6,9,10,12,18,22,27], soil's grazing intensity (under-and overgrazing) can lower carbon sequestration or lead to carbon losses. These authors observed efects of grazing mediated by changes in the removal, growth, carbon allocation and lora in pastures and carbon input from ruminant excreta, which afect the amount of carbon in soils [27,36,40].…”

Section: Introductionmentioning

confidence: 98%

Sustainable Pasture Management

Sevov¹,

Yancheva²,

Kazakova³

2018

New Perspectives in Forage Crops

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Grasslands which are a major part of the global ecosystem, covering 37% of the earth's terrestrial area, have a signiicant contribution to food security through providing most of the energy and proteins required by the ruminants used for meat and dairy production. Grasslands are considered to have the potential to play a fundamental role in climate change mitigation, particularly regarding carbon storage and sequestration and for biodiversity preservation. This chapter provides an overview of the causes of the pasture degradation and some essential elements for sustainable management, which aims to improve the quantity and quality of pasture, mitigation of climate change and biodiversity preservation. Another point of this chapter is the grasslands with high nature value that nowadays is a top priority in the European legislation as the European Commission has conirmed that HNV farming will remain a key priority in 2014-2020. We present the situation in Bulgaria because it is one of the irst member state countries that have assessed HNV regions and put funding in place to support them.

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Carbon and Nitrogen Losses from Soil Depend on Degradation of Tibetan Kobresia Pastures

Cited by 51 publications

References 69 publications

Offsetting land degradation through nitrogen and water management during maize cultivation under arid conditions

Offsetting land degradation through nitrogen and water management during maize cultivation under arid conditions

Responses of Degraded Tibetan Kobresia Pastures to N Addition

Sustainable Pasture Management

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