Publications by authors named "Yan-Jiang Cai"

Denitrification driven by bacteria and fungi is the main source of nitrous oxide (NO) emissions from paddy soil. It is generally believed that biochar reduces NO emissions by influencing the bacterial denitrification process, but the relevant mechanism of its impact on fungal denitrification is still unclear. In this study, the long-term straw carbonization returning experimental field in Changshu Agricultural Ecological Experimental Base of the Chinese Academy of Sciences was taken as the object.

View Article and Find Full Text PDF

We investigated the effects of maize straw and its biochar application on soil organic carbon chemical composition, the abundance of carbon degradation genes (I) and the composition of I gene community in a Moso bamboo forest, to provide the theoretical and scientific basis for enhancing carbon sequestration. We conducted a one-year field experiment in a subtropical Moso bamboo forest with three treatments: control (0 t C·hm), maize straw (5 t C·hm), and maize straw biochar (5 t C·hm). Soil samples were collected at the 3 and 12 months after the treatment.

View Article and Find Full Text PDF

To investigate the effects of short-term nitrogen (N) deposition on organic matter composition of litter and soil in Moso bamboo () forests, we established a N-addition treatments (50 kg N·hm·a) to simulate the ambient and N deposition in a subtropical Moso bamboo forest from July 2020 to January 2022. We analyzed the organic matter composition of Moso bamboo leaf/root litter and soil by using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) technique. The results showed that short-term N deposition significantly increased the relative content of soil phenols by 50.

View Article and Find Full Text PDF
Article Synopsis
  • Researchers are investigating how microplastic pollution, particularly low-density polyethylene (LDPE) microplastics, affects crop growth and health, focusing on water spinach in a controlled pot experiment.
  • Results indicated that higher concentrations of LDPE MPs significantly reduced seed vigor but surprisingly promoted aboveground biomass at 5% concentration.
  • The study found that LDPE MPs enhanced antioxidant enzyme activities and soluble sugar content in water spinach, suggesting that the plant can manage oxidative stress induced by microplastic exposure.
View Article and Find Full Text PDF

Plant residues can affect C:N:P of soil, microbial biomass, and extracellular enzyme, but the effects are still unclear. We conducted a field experiment in an alpine meadow on the eastern part of the Qinghai-Tibetan Plateau to explore the effects of removing aboveground plant or roots and adding plant residues on the C:N:P of soil, microbial biomass, and extracellular enzyme. The results showed that removing aboveground plant biomass significantly decreased soil C:N (the change was -23.

View Article and Find Full Text PDF

Removal of invasive plant species is the first step to restoring the invaded ecosystems. The soil microbial biomass and extracellular enzyme activities were measured in Moso bamboo () pure forest (completely invasion), invasive removal forest (secondary succession 5 years after clear cutting), and the evergreen broadleaved forest (no invasion) in Tianmu Mountain. The results showed that compared with pure forest, invasive removal significantly increased the contents of soil organic carbon (SOC), nitrate nitrogen, available phosphorus and potassium, as well as microbial biomass carbon (MBC) and microbial biomass phosphorus (MBP), while significantly decreased microbial biomass nitrogen (MBN).

View Article and Find Full Text PDF

In July 2019-July 2020, we conducted a field trial to examine the effects of nitrogen addition (60 kg N·hm·a), biochar application (10 t·hm), and their combination on soil NO emission and the relationship between soil NO emission and environmental factors in a typical Moso bamboo () plantation in Hangzhou City of Zhejiang Province. Soil NO flux of Moso bamboo plantation was measured by the static chamber-gas chromatography technique. The results showed that nitrogen addition treatment increased the annual cumulative NO emission by 14.

View Article and Find Full Text PDF

Soil denitrifying enzyme activity (DEA) was measured by acetylene inhibition technique, along with exploration of factors influencing DEA in a bamboo forest riparian zone in the upper reaches of the Taihu Lake Basin during summer. Our aim was to provide important insights into the assessment of ecological functions of bamboo forest riparian zone on reducing nitrogen pollution in rivers. The results showed that the riparian soil DEA ranged from 6.

View Article and Find Full Text PDF

Inland waters are vital sinks for active carbon (C) and potential sources of greenhouse gas emissions. In this study, the characteristics of dissolved carbon dioxide (CO) and methane (CH) concentrations in the Nantiaoxi River system in the upper reaches of the Taihu Lake basin were observed between Jul. 2019 and Nov.

View Article and Find Full Text PDF

Freezing-thawing cycles often occurs in the regions of mid-high latitude and high altitude. This process can affect soil physical and biological properties, e.g.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_sessionfh9qbsiq2a41kbiei93ialnk5kiumke2): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once