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298 results on '"Zhang, Xingchang"'

34. Ecoenzymatic stoichiometry reveals widespread soil phosphorus limitation to microbial metabolism across Chinese forests

Author

Chinese Academy of Sciences, National Natural Science Foundation of China, State Key Laboratory of Loess and Quaternary Geology (China), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), European Commission, Junta de Andalucía, Delgado-Baquerizo, Manuel [0000-0002-6499-576X], Peng, Shushi [0000-0001-5098-726X], Chen, Ji [0000-0001-7026-6312], Fang, Linchuan [0000-0003-1923-7908], Zhu, Biao [0000-0001-9858-7943], Moorhead, Daryl L. [0000-0002-3460-5302], Cui, Yongxing, Bing, Haijian, Moorhead, Daryl L., Delgado-Baquerizo, Manuel, Ye, Luping, Yu, Jialuo, Zhang, Shangpeng, Wang, Xia, Peng, Shushi, Guo, Xue, Zhu, Biao, Chen, Ji, Tan, Wenfeng, Wang, Yunqiang, Zhang, Xingchang, Fang, Linchuan, Chinese Academy of Sciences, National Natural Science Foundation of China, State Key Laboratory of Loess and Quaternary Geology (China), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), European Commission, Junta de Andalucía, Delgado-Baquerizo, Manuel [0000-0002-6499-576X], Peng, Shushi [0000-0001-5098-726X], Chen, Ji [0000-0001-7026-6312], Fang, Linchuan [0000-0003-1923-7908], Zhu, Biao [0000-0001-9858-7943], Moorhead, Daryl L. [0000-0002-3460-5302], Cui, Yongxing, Bing, Haijian, Moorhead, Daryl L., Delgado-Baquerizo, Manuel, Ye, Luping, Yu, Jialuo, Zhang, Shangpeng, Wang, Xia, Peng, Shushi, Guo, Xue, Zhu, Biao, Chen, Ji, Tan, Wenfeng, Wang, Yunqiang, Zhang, Xingchang, and Fang, Linchuan

Abstract

Forest soils contain a large amount of organic carbon and contribute to terrestrial carbon sequestration. However, we still have a poor understanding of what nutrients limit soil microbial metabolism that drives soil carbon release across the range of boreal to tropical forests. Here we used ecoenzymatic stoichiometry methods to investigate the patterns of microbial nutrient limitations within soil profiles (organic, eluvial and parent material horizons) across 181 forest sites throughout China. Results show that, in 80% of these forests, soil microbes were limited by phosphorus availability. Microbial phosphorus limitation increased with soil depth and from boreal to tropical forests as ecosystems become wetter, warmer, more productive, and is affected by anthropogenic nitrogen deposition. We also observed an unexpected shift in the latitudinal pattern of microbial phosphorus limitation with the lowest phosphorus limitation in the warm temperate zone (41-42 degrees N). Our study highlights the importance of soil phosphorus limitation to restoring forests and predicting their carbon sinks. Phosphorus limitation of soil microbial communities in forests is widespread, increases with soil depth, and is enhanced under wetter and warmer climates and elevated anthropogenic nitrogen deposition, according to ecoenzymatic stoichiometric analyses across 181 forests in China.

Published
2022

36. The Effect of Integrated Grasses in Controlling Soil, Nutrient and Organic Matter in Loess Plateau, China

Author

Honest Augustine Mosha and Zhang Xingchang

Subjects
Integrated grasses, White clover, Rye grass, Sediment loss, Loess Plateua, Nutrient loss, Soil erosion, Social Sciences
Abstract

Soil and nutrient loss is one of a serious problem in Loess plateau china. The eroded materials are directly transported to the lakes and rivers specifically yellow river in China, this might lead to eutrophication if no prevention measures will be taken. The experiment was conducted on soil, and nutrient loss from 5º slope. Individual grasses plots for rye grass(Lolium), white clover(Trifolium repens) and integrated grass (rye + white clover) plots were prepared with a percentage cover of 25, 50, 80 and 100 in each treatment. Bare land was used as a reference plot. The results show that, the sediment loss in a bare land reported to be 1.5, 3, 2.7 and 1.3, 2.1, 1.9 in 100 % and 80 % cover plots. The runoff rate as compared to bare land, shown to be about 2 times less for white clover and rye grass plots, while more than 2 times less for integrated grasses plots. The total nitrogen and organic matter loss the results were in the order bare land white clover rye grasses and integrated grasses in which 100 %, 80 % and 50 % vegetative cover shown to perform better. On average enrichment ratio range was 40 % to 90 % for nutrient loss, and 50 % to 85 % for organic matter for all plots in comparison with soil origin. The enrichment ration significantly shown to be high from bare land> rye and white clover plots> integrated grasses plot. It has been concluded that integrated grasses is more effective measure over others in controlling both soil, nutrient and organic matter loss in the soil. This study contributed some information on the erosion modeling and improvement of soil and grassland conservation techniques for better land use for sustainable development

Published
2013

37. Anisotropic Strain‐Mediated Symmetry Engineering and Enhancement of Ferroelectricity in Hf0.5Zr0.5O2/La0.67Sr0.33MnO3 Heterostructures.

Author

Liu, Kai, Jin, Feng, Zhang, Xingchang, Liu, Kuan, Zhang, Zixun, Hua, Enda, Zhang, Jinfeng, Ye, Huan, Gao, Guanyin, Ma, Chao, Wang, Lingfei, and Wu, Wenbin

Subjects
FERROELECTRICITY, HETEROSTRUCTURES, SYMMETRY, HAFNIUM oxide, ELECTRONIC equipment, LEAD titanate
Abstract

Hafnium‐based binary oxides have attracted considerable attention due to their robust ferroelectricity at the nanoscale and compatibility with silicon‐based electronic technologies. To further promote the potential of Hafnium oxides for practical device applications, it is essential to effectively harness the interplay between structural symmetry, domain configuration, and ferroelectricity. Here, using Hf0.5Zr0.5O2/La0.67Sr0.33MnO3 (HZO/LSMO) heterostructures as a model system, the anisotropic strain‐mediated symmetry engineering and ferroelectricity enhancement are systematically investigated. By growing the heterostructures on (110)‐oriented perovskite substrates, considerable anisotropic strain is imposed on the LSMO bottom electrodes. Such an anisotropically‐strained LSMO layer acts as a structural template and effectively tune the structural symmetry, polar/non‐polar phase ratio, and ferroelectricity of the HZO top layer. Specifically, the anisotropic tensile strain stabilizes the ferroelectric rhombohedral and orthorhombic phases, thus enhancing the remnant polarization (Pr) up to 22 µC cm−2. In contrast, the anisotropic compressive strain facilitates the formation of non‐ferroelectric tetragonal phases, leading to a suppressed Pr down to 8 µC cm−2. These findings provide a guideline for understanding and modulating the intrinsic structure‐ferroelectricity relationship of HZO through anisotropic strain‐mediated symmetry engineering, which may shed light on the development of hafnium‐oxide‐based electronic devices. [ABSTRACT FROM AUTHOR]

Published
2023
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