TL;DR: In this article, a total of 1400 soil samples from the plow layer (0-20cm) at an approximate interval of 5km were collected in the autumn of 2002 over the entire black soil arable crops region to determine the spatial variability of seven variables, such as total organic matter content (OMC), total N, total P, total K, alkali-dissolvable N (AN), available P (AP), and available K (AK), with classical statistics and geostatistical analysis across the whole black soil area in Northeast China.

TL;DR: In this paper, a water collection system was designed to collect runoff and leachates for both the rice and wheat seasons and found that dissolved nitrogen (DN), rather than particulate N (PN), was the main form of nitrogen loss by runoff.

TL;DR: In this article, the nitrogen volatilization losses, nitrogen utilization efficiency, and rice yields in response to urea application to a rice field were investigated in Wangzhuang Town, Changshu City, Jiangsu Province, China.

TL;DR: Wu et al. as mentioned in this paper collected top soil samples from 27 paddy fields and 75 vegetable fields from a typical industry-based pen-urban area of about 8km 2 in Wuxi, China, to study the accumulation and distribution of As, Hg, Cu, Zn, Pb, Cr, and Cd in comparison with heavy metal contents in soils near developed industrial sites.

TL;DR: For plants that transport gases using the molecular diffusion mechanism only, the diel variation of CH 4 emissions was because of differences in the magnitude of O 2 produced through photosynthesis and then delivered into the rhizomes and/or rhizosphere for CH 4 oxidation.

TL;DR: In this article, the nitrogen pollution status of the 12 most important rivers in Changshu, Taihu Lake region was investigated using tension-free monolith lysimeters and 15N-labeled fertilizer.

TL;DR: In this article, a 3-year tillage experiment consisting of moldboard plow (MP), ridge tillage (RT), and no-tillage (NT) was performed in a randomized complete block design with four replicates.

TL;DR: In this article, the effect of aluminum and cadmium (Cd) on Al and mineral nutrient contents in plants and Al-induced organic acid exudation in two barley varieties with different Al tolerance was investigated.

TL;DR: In this paper, a long-term experiment was conducted to investigate how longterm fertilization and rice straw incorporation into soil affect soil glomalin, C and N. The combined application of chemical fertilizer and straw resulted in a significant increase in both soil easily extractable Glomalin (EEG) and total GLomalin concentrations, as compared with application of only chemical fertilizer or no fertilizer application.

TL;DR: In this article, a field experiment using a split-plot randomized complete block design with three replications was carried out to determine relationships between spectral indices and wheat grain yield (GY), to compare the performance of four vegetation indices (VIs) for GY prediction, and to study the feasibility of VI to estimate grain protein content (GPC) in winter wheat.

TL;DR: In this paper, the catalysis of manganese(Ⅱ) (Mn(superscript 2+) on chromium (Ⅵ) reduction by citrate was studied through batch experiments.

TL;DR: Wet stability, penetration resistance (PR), and tensile strength (TS) of paddy soils under a fertilization experiment for 22 years were determined to elucidate the function of soil organic matter in paddy soil stabilization as mentioned in this paper.

TL;DR: Wang et al. as mentioned in this paper investigated the spatial pattern of soil erosion rates associated with slope-land under hoe tillage in Neijiang of the Sichuan Hilly Basin.

TL;DR: A field experiment was conducted to investigate the fate of 15N-labeled urea and its residual effect under the winter wheat (Triticum aestivum L.) and summer maize (Zea mays L.) rotation system on the North China Plain this paper.

TL;DR: In this article, a field study for 2.5 years at three sites, i.e., Jhottianwala, Gabrika (Thabal), and Thatta Langar, in Tehsil Pindi Bhattian, Hafizabad District, Pakistan.

TL;DR: In this article, the adverse effects of ammonium nutrition on plant growth may be related to carbon gain, photosynthesis, and photorespiration, but there is no consistent evidence of a specific mechanism that could explain the plant growth reduction under ammonium supply.

TL;DR: In this paper, the root exudates, rhizosphere Zn fractions, and Zn concentrations and accumulations of two ryegrass cultivars (Lolium perenne L. cvs. Airs and Tede) at different soil Zn levels (0, 2, 4, 8, and 16 mmol kg^(-1) soil).

TL;DR: In this paper, the authors analyzed total concentrations and fractions of selected heavy metals (Cd, Cr, Cu, Pb, and Zn) in surface sediments from Dianchi Lake, Yunnan Province, China, as well as factors that may affect distributions of various heavy metal fractions.

TL;DR: In this article, the state of the contamination and distribution of polycyclic aromatic hydrocarbons (PAH) in agricultural soils in the subtropical regions of China was revealed.

TL;DR: Analysis of 16S rDNA clone libraries from the rhizosphere soils indicates that the changes in bacterial composition may occur concomitantly with the shift of species composition in plant communities.

TL;DR: In this article, a field experiment was established in 2002 to examine the relationship among N fertilization rate, soil NO3-N, and groundwater contamination in the North China Plain, where summer corn and winter wheat are the major crops grown.

TL;DR: In this article, a lysimeter experiment with undisturbed soil profiles was carried out to study nitrogen cycling and losses in a paddy soil with applications of coated urea and urea under a rice-wheat rotation system in the Taihu Lake region from 2001 to 2003.

TL;DR: In this paper, the authors measured CH4, N2O and CO2 emissions from northeast Chinese rice fields in the fallow season (November to March) to investigate the effects of freezing-thawing on the emissions.

TL;DR: In this paper, the authors evaluated the long-term effect of five doses of municipal solid waste (MSW) addition on the microbiological, biochemical, and physical properties of semiarid soil.

TL;DR: Landsat Thematic Mapper (TM) and enhanced thematic mapper plus (ETM+) images in 1985, 1986, 1993, 1994 and 2001 were used to quantify the land use and land cover changes (LUCC) in the Zhejiang coastal region with a stratified unsupervised classification technique in conjunction with visual interpretation and to attempt an identification of the socioeconomic driving forces as mentioned in this paper.

TL;DR: In this article, a coastal saline field of 10.5 ha was selected as the study site and 122 bulk electrical conductivity (ECb) measurements were performed thrice in situ in the topsoil (0-20 cm) across the field using a hand held device to assess the spatial variability and temporal stability of the distribution of soil electrical conductivities (EC), to identify the management zones using cluster analysis based on the spatiotemporal variability of soil EC, and to evaluate the probable potential for site-specific management in coastal regions with conventional statistics and geostatistical

TL;DR: The sediment redox potential was raised in the laboratory to estimate reduction of internal available phosphorus loads, such as soluble reactive phosphorus (SRP) and total phosphorus (TP), as well as the main elements of sediment extracts in Dianchi Lake.

TL;DR: In this paper, two types of constructed wetlands for the treatment of low-concentration polluted eutrophic landscape river water were studied in the western section of the Qingyuan River at the Minhang campus of Shanghai Jiaotong University.

TL;DR: In this article, the effects of long-term application of inorganic fertilizers on the biochemical properties of a rice-planting soil derived from Quaternary red earth were investigated.