Research Article| April 01, 2012 Microbial lipid records of highly alkaline deposits and enhanced aridity associated with significant uplift the Tibetan Plateau in Late Miocene Shucheng Xie; Xie * 1State Key Laboratory Biogeology Environmental Geology, China University Geosciences, Wuhan 430074, China2Organic Geochemistry Unit, Bristol Biogeochemistry Centre Cabot Institute, School Chemistry, Bristol, Cantock's Close, BS8 1TS, UK *E-mail: xiecug@163.com. Search for other works by this author...

Heavy metal pollution in agricultural soil has been tightly associated with anthropogenic emissions. Although there are many studies that focus on a regional scale, the source identification of heavy contamination field scale around industrial areas remains unclear. The average concentrations topsoils Hg, Cd, As, Pb, Cr, Ni, Zn, and Cu were 2.07, 0.13, 8.56, 42.3, 81.1, 37.3, 105, 43.8 mg kg−1, respectively. enrichment Hg was particularly presented topsoils, highest single index (Pi) (9.00)...

River terraces are the principal geomorphic features for unraveling tectonics, sea level, and climate conditions during evolutionary history of a river. The increasing availability high-resolution topography data generated by low-cost Unmanned Aerial Systems (UAS) modern photogrammetry offer an opportunity to identify characterize these features. In this paper, we assessed capabilities UAS-based Structure-from-Motion (SfM) photogrammetry, coupled with river terrace detection algorithm...

Extreme drought has negative impacts on the health of vegetation and stability ecosystems. In this study, CASA model was employed to estimate net primary productivity over Yunnan Plateau. The time-lag effects were observed within a 0–6 month period extreme droughts using Pearson correlation coefficient. resistance during quantified, recovery capability following these events analyzed ARIMA model. Moreover, study investigated response across diverse altitudinal gradients. results showed that:...

Summary Background: Advanced decision-support capabilities for prehospital trauma care may prove effective at improving patient care. Such functionality would be possible if an analysis platform were connected to a transport vital-signs monitor. In practice, there are technical challenges implementing such system. Not only must each individual component reliable, but, in addition, the connectivity between components reliable. Objective: We describe development, validation, and deployment of...

Abstract Rainfall partitioning by the vegetation canopy into stemflow (SF) and throughfall (TF) plays a crucial role in soil infiltration local water balance. This study aims to quantify differences SF TF between two sand‐binding shrubs, Caragana liouana Salix psammophila , desert steppe, clarify effects of biotic abiotic factors on them using boosted regression trees (BRT) model, compare moisture replenishment during growing seasons 2021 2022. Under identical rainfall conditions, canopies...

As an important barrier against desert invasion in Northwest China, Helan Mountains (HL), Luoshan (LS) and their natural forests have extremely ecological status. It is of great significance to study the relationship between forest growth climate this region under background global change. At present, relevant research mostly focuses on Chinese pine (Pinus tabulaeformis Carr.), little known about how Qinghai spruce (Picea crassifolia Kom.) responds To investigate potential relationships...

荒漠草原"土岛"生境群落物种共存机制

Temperature lapse rate (TLR), measured as the degree of temperature change along an altitudinal gradient, is a key indicator multiple ecological processes mountain systems. Although many studies have examined changes open air or near-surface altitudes, we know little about variations soil temperature, which play important role in regulating growth and reproduction organisms, well ecosystem nutrient cycling. Based on data (15 cm above ground) layers (8 below from 12 sampling sites subtropical...

The spatial and temporal dynamic monitoring of the heavy metal concentration in agricultural soils can help us to understand extent changes regional soil pollution, allowing safeguard food safety human health provide basic data for prevention control pollution soils. metals’ concentrations, including Cd, Cr, Cu, Hg, Ni, Pb, Zn, As, were measured surface (0–20 cm) samples collected 2017 2021 from agriculture land evaluate their levels Ningxia Hui Autonomous Region (Hereinafter referred as...

2007年1月-2010年10月,对杭州西湖进行调查研究,利用综合营养状态指数对西湖的营养状况进行评价,通过种类组成、优势种、多样性指数等指标探讨西湖轮虫的群落结构与水体营养状况之间的关系.结果表明,西湖总体处于中-富营养状态.调查期间共检出轮虫29种,以角突臂尾轮虫(Brachionus angularis)、螺形龟甲轮虫(Keratella cochlearis)等最为常见;总数量处于较低的水平,多样性水平不高;各采样点在不同年份表现出不同的季节变化规律.相关性分析结果表明,西湖轮虫密度与水温、TLI指数、总氮、高锰酸盐指数、透明度和pH值的相关性高度显著;Margalef多样性指数和Shan-non-Wiener多样性指数与水体环境因子表现出不同的相关性.研究发现,西湖轮虫结构不仅与水体的营养状况关系密切,还受引水过程引起的水动力学的影响,从引水入湖口到出水口存在一个以水动力学过程为主导的生态梯度.;In the present study we evaluated trophic status of West Lake on basis investigations...

The Qilian Mountains (QLMs) serve as an 'eco-security barrier' in western China, substantially impacting downstream ecosystems and water resource utilization. However, the hydrological evolution characteristics of QLMs during last millennium remain controversial, ecological response to climate change remains poorly understood. Here, we present a pH record based on brGDGTs (branched glycerol dialkyl tetraethers) of 14C-dated sediments from Lake Maozangtianchi compare it with X-ray...

As an important bridge connecting aboveground communities and belowground biological processes, soil microorganisms play role in regulating ecological processes. The altitudinal changes driving factors of microbial community mountain ecosystem arid region are still unclear. We measured physicochemical properties at seven altitudes the range 1300-2800 m Helan Mountains, investigated understory composition, properties, community. factor for was explored by variance partitioning analysis...

Cyanobacterial blooms tied to volcanism during the 5 m.y.

Understanding altitudinal variation characteristics and driving mechanism of soil enzyme activities their stoichiometry is great significance for studying nutrient cycling in fragile mountain forest ecosystems. In this study, we collected samples from different altitudes (1380-2438 m) Helan Mountains to analyze the changes physicochemical properties, its influencing factors. The results showed that β-glucosidase (βG) β-N-acetylglucosaminidase (NAG) ratios C/N C/P firstly increased then...

Coal gangue and fly ash are major industrial solid wastes containing some nutrients associated with organic or mineral matter. Vegetation restoration depends on high-quality soil in mining sites. Exploring the effects of wood vinegar (WV) irrigation addition variation chemical properties coal substrate can provide a theoretical basis data support for reconstruction mine soils resource utilization wastes. The indoor incubation experiment was conducted by adding at rates 0, 10%, 20% 50% to...

The core of scientific greening in arid areas is 'greening based on water'. One its preconditions the potential causal relationship between vegetation construction and habitat drought. However, factors or processes ecology generally difficult to accurately define describe, especially for complex ecosystems. To scientifically carry out water', it necessary clarify hydrological cycle drylands, basis conditions Taking pilot demonstration province Ningxia as an example, we started with...