Climate variability, ecological gradient and the Northeast China Transect (NECT)

Ni, Jian; Zhang, Xinshi

doi:10.1006/jare.2000.0667

Cited by 111 publications

(107 citation statements)

References 4 publications

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“…As influenced by the Siberia-Mongolia anticyclone in winter and moist Pacific air masses in summer, the climate varies from warm and moist in the east to cold and dry in the west. The lofty Daxingan Mountains also have some effects on the spatial pattern of the climate, and the highest annual precipitation and the lowest annual mean temperature occur at their summit (Zhang, 1998;Ni and Zhang, 2000). Under the influence of the climate, natural vegetation types from east to west are as follows: oak (Quercus mongolica) forest (OF), larch (Larix gmelini) forest (LF), forest-steppe mosaic (FS), pine (Pinus sylvestris) forest (PF), semi-humid steppe (HS), and semi-arid steppe (AS).…”

Section: Site Descriptionmentioning

confidence: 99%

Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

Wang

Ouyang

2009

Pedosphere

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Soil organic carbon (SOC) can act as a sink or source of atmospheric carbon dioxide; therefore, it is important to understand the amount and composition of SOC in terrestrial ecosystems, the spatial variation in SOC, and the underlying mechanisms that stabilize SOC. In this study, density fractionation and acid hydrolysis were used to assess the spatial variation in SOC, the heavy fraction of organic carbon (HFOC), and the resistant organic carbon (ROC) in soils of the southern Hulun Buir region, northeastern China, and to identify the major factors that contribute to this variation. The results showed that as the contents of clay and silt particles (0-50 μm) increased, both methylene blue (MB) adsorption by soil minerals and microaggregate contents increased in the 0-20 and 20-40 cm soil layers (P < 0.05). Although varying with vegetation types, SOC, HFOC, and ROC contents increased significantly with the content of clay and silt particles, MB adsorption by soil minerals, and microaggregate content (P < 0.05), suggesting that soil texture, the MB adsorption by soil minerals, and microaggregate abundance might be important factors influencing the spatial heterogeneity of carbon contents in soils of the southern Hulun Buir region.

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Section: Site Descriptionmentioning

confidence: 99%

Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

Wang

Ouyang

2009

Pedosphere

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“…NECT acts as an effective platform for investigating of the influences of water on land use in terrestrial ecosystems (Ni and Zhang 2000;Nie et al 2012). The physiognomy of vegetation is closely related to the distribution of water, which determines the spatial patterns of land use on a large scale (Zhang and Zhou 2010).…”

Section: Cluster Analysis: Spatial Variability Of Droughtsmentioning

confidence: 99%

“…4). At present, large areas of grassland and forest were converted to agricultural fields, destroying much of the natural environment in this area (Ni and Zhang 2000). In addition to altering ecosystem services, the conversion of forest or grassland to cropland alters the hydrological cycle over a range of scales (Anav et al 2010;Otieno and Anyah 2012;Pitman 2004).…”

Section: Cluster Analysis: Spatial Variability Of Droughtsmentioning

confidence: 99%

“…The Northeast China Transect (NECT) is identified as a mid-latitude semiarid terrestrial transect by the International Geosphere-Biosphere Programme (IGBP) (Ni and Zhang 2000), which is mainly driven by precipitation, and has become an effective platform for the global change research in China (Nie et al 2012;Zhou et al 2002;Zhu et al 2006). Meanwhile, the NECT also represents an important base of forestry, agricultural and pastoral productions in China.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the NECT also represents an important base of forestry, agricultural and pastoral productions in China. Land across the NECT produces wood, hay, grain crops (maize, soybean, wheat and rice) and cattle (leather, wool and milk) (Ni and Zhang 2000). Consequently, it is worthwhile to study the long-term time series of precipitation regarding the non-homogeneous climatic and hydrological conditions for water supply management and for crop and cattle productivity in this transect.…”

Section: Introductionmentioning

confidence: 99%

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Spatial and temporal characteristics of droughts in the Northeast China Transect

et al. 2014

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In this study, drought trends and change magnitudes of the Northeast China Transect (NECT) were analyzed using the Mann-Kendall test and Theil-Sen's slope estimator. Meteorological data from 20 meteorological stations of NECT region from 1957 to 2012 were used. Results demonstrated that five stations had significant negative trends in precipitation. The magnitudes of the significant negative trends at the 95 % confidence level varied from -2.41 ± 1.05 mm year -1 at Tonghe station to -1.11 ± 0.51 mm year -1 at Qianguoerluosi station. Analysis of the seasonal precipitation series showed a mix of negative and positive trends. Many stations also exhibited strong contrasting seasonal trends that counterbalanced one other at the yearly level. In addition, cluster analysis based on discrete wavelet transform (DWT) was applied to the standard precipitation index (SPI) series. Results revealed three different and spatially well-defined subregions (east, center and west regions of NECT). Due to the decrease in precipitation from the east to the west, land use varies from forest regions in the east, to agriculture in the center, to pastoral areas in the west. Characteristics of drought events for each representative station of different subregions are explored using temporal evolution of the SPI values. Results showed that severe or extreme droughts occurred in 2001, 2003 in Tonghe, 1980 in Tongliao and 2005 123Nat Hazards (2015) 76:601-614 DOI 10.1007/s11069-014-1507 has great potential for examining spatial coherence of regional drought, which was consistent with not only the precipitation spatial distribution but also the characteristics of land use in the study area. This study not only provides important information on drought variability in the NECT, but also provides useful information for improving water management strategies and planning agricultural practices.

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Phenological responses to nitrogen and water addition are linked to plant growth patterns in a desert herbaceous community

Huang

2018

Ecology and Evolution

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Increases in nitrogen (N) deposition and variation in precipitation have been occurring in temperate deserts; however, little information is available regarding plant phenological responses to environmental cues and their relationships with plant growth pattern in desert ecosystems. In this study, plant phenology and growth of six annuals in response to N and water addition were monitored throughout two consecutive growing seasons in 2011 and 2012 in a temperate desert in northwestern China. The effects of N and water addition on reproductive phenology differed among plant species. N and water addition consistently advanced the flowering onset time and fruiting time of four spring ephemerals; however, their effects on two spring‐summer annuals were inconsistent, with advances being noted in one species and delays in another. N and water addition alone increased plant height, relative growth rate, leaf number, flower number, and individual biomass, while their combinative effects on plant growth and reproductive phenology were dependent on species. Multiple regression analysis showed that flowering onset time was negatively correlated with relative growth rate of two species, and negatively correlated with maximum plant height of the other four species. Our study demonstrates that phenological responses to increasing precipitation and N deposition varied in annuals with different life histories, whereby the effects of climate change on plant growth rate were related to reproductive phenology. Desert annuals that were able to accelerate growth rate under increasing soil resource availability tended to advance their flowering onset time to escape drought later in the growing season. This study promotes our understanding of the responses of temperate desert annuals to increasing precipitation and N deposition in this desert.

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Climate variability, ecological gradient and the Northeast China Transect (NECT)

Cited by 111 publications

References 4 publications

Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

Soil Organic Carbon and Its Fractions Across Vegetation Types: Effects of Soil Mineral Surface Area and Microaggregates

Spatial and temporal characteristics of droughts in the Northeast China Transect

Phenological responses to nitrogen and water addition are linked to plant growth patterns in a desert herbaceous community

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