Biotic and abiotic controls on the diel and seasonal variation in soil respiration and its components in a wheat field under long-term nitrogen fertilization

2016 ◽  
Vol 199 ◽  
pp. 1-9 ◽  
Author(s):  
Yangquanwei Zhong ◽  
Weiming Yan ◽  
Yuzheng Zong ◽  
Zhouping Shangguan
Keyword(s):  
Seasonal Variation ◽  
Soil Respiration ◽  
Nitrogen Fertilization ◽  
Wheat Field ◽  
Abiotic Controls

scholarly journals PENGARUH SISTEM OLAH TANAH DAN PEMUPUKAN NITROGEN JANGKA PANJANG TERHADAP RESPIRASI TANAH DI LAHAN POLITEKNIK NEGERI LAMPUNG TAHUN TANAM KE-27

2020 ◽  
Vol 8 (2) ◽  
pp. 247
Author(s):  
Erdiana Damayanti ◽  
Muhajir Utomo ◽  
Ainin Niswati ◽  
Henrie Buchari
Keyword(s):  
Soil Respiration ◽  
Co2 Emissions ◽  
Nitrogen Fertilizer ◽  
Nitrogen Fertilization ◽  
Conservation Tillage ◽  
N Fertilization ◽  
No Tillage ◽  
Tillage Systems ◽  
Tillage System

Unsustainable cultivation techniques can cause carbon loss on farm.   The cultivation technique that is often used by farmers today is intensive tillage.  Intensive tillage can increase CO2. Steps to reduce CO2 gas emissions, while increasing carbon stored in the soil by implementing agricultural cultivation with conservation tillage system (Olah Tanah Konservasi). The conservation tillage system is able to reduce global warming through absorption of C in the soil, and reduce CO2 emissions. In addition, fertilization can also affect CO2 emissions. CO2 emissions in the soil come from soil respiration. The purpose of this study was to determine the effect of long-term tillage systems on soil respiration, determine the effect of long-term N fertilization on soil respiration, and determine the effect of interactions between tillage systems and long-term N fertilization on soil respiration. The study was arranged in a randomized block design (RBD) consisting of two factors, namely the tillage system and nitrogen fertilization factors. The first factor is the treatment of tillage system (T) namely T0 = no tillage, and T1 = intensive tillage, while the second factor is without nitrogen fertilizer (N0) and high nitrogen fertilizer (N1). The data obtained will be tested for homogeneity by Bartlett Test and additives tested by Tukey Test. Furthermore, the data were analyzed by analysis of variance and continued with a BNJ test of 5% level. Observation of soil respiration was done 4 times, namely -1, 1, 2, 3 days after tillage. The results showed that soil respiration one day before to three days after the soil was treated in intensive tillage (OTI) was the same as the no tillage system (TOT), soil respiration -1 days after tillage to 3 days after tillage on nitrogen fertilization (100 N kg ha-1 ) given in the previous planting season the same as without fertilization (0 kg N ha-1), and there is no interaction between the tillage system and nitrogen fertilization on soil respiration.

Long Term Monitoring of the Macrobenthos of the Upper Clyde Estuary

1984 ◽  
Vol 16 (5-7) ◽  
pp. 359-373 ◽  
Author(s):  
Anne R Henderson
Keyword(s):  
Water Quality ◽  
Seasonal Variation ◽  
Organic Pollution ◽  
Long Term Changes ◽  
Pollution Loading ◽  
Faunal Density ◽  
History Of ◽  
Long Term Monitoring ◽  
Term Monitoring

The sublittoral macrobenthic invertebrate populations of the Upper Clyde Estuary are described. The estuary has a long history of organic pollution. The long term changes in species composition, faunal density and dominance patterns between 1974 and 1980 are presented. The fauna is dominated by brackish, pollution tolerant oligochaetes and polychaetes. Fluctuations in populations can be related to both seasonal variation in environmental conditions and long term improvements in water quality through a reduction in pollution loading to the estuary.

scholarly journals Vegetation and microbes interact to preserve carbon in many wooded peatlands

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Hongjun Wang ◽  
Jianqing Tian ◽  
Huai Chen ◽  
Mengchi Ho ◽  
Rytas Vilgalys ◽  
...  
Keyword(s):  
Microbial Composition ◽  
Ecological Traits ◽  
Low Latitude ◽  
Carbon Decomposition ◽  
Positive Effects ◽  
Recalcitrant Carbon ◽  
Effects Of Temperature ◽  
Abiotic Controls ◽  
Slow Growing

AbstractPeatlands have persisted as massive carbon sinks over millennia, even during past periods of climate change. The commonly accepted theory of abiotic controls (mainly anoxia and low temperature) over carbon decomposition cannot fully explain how vast low-latitude shrub/tree dominated (wooded) peatlands consistently accrete peat under warm and seasonally unsaturated conditions. Here we show, by comparing the composition and ecological traits of microbes between Sphagnum- and shrub-dominated peatlands, that slow-growing microbes decisively dominate the studied shrub-dominated peatlands, concomitant with plant-induced increases in highly recalcitrant carbon and phenolics. The slow-growing microbes metabolize organic matter thirty times slower than the fast-growing microbes that dominate our Sphagnum-dominated site. We suggest that the high-phenolic shrub/tree induced shifts in microbial composition may compensate for positive effects of temperature and/or drought on metabolism over time in peatlands. This biotic self-sustaining process that modulates abiotic controls on carbon cycling may improve projections of long-term, climate-carbon feedbacks in peatlands.

scholarly journals Seasonal Patterns of Soil Respiration and Related Soil Biochemical Properties under Nitrogen Addition in Winter Wheat Field

PLoS ONE ◽  
2015 ◽  
Vol 10 (12) ◽  
pp. e0144115 ◽  
Author(s):  
Guopeng Liang ◽  
Albert A. Houssou ◽  
Huijun Wu ◽  
Dianxiong Cai ◽  
Xueping Wu ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Winter Wheat ◽  
Nitrogen Addition ◽  
Biochemical Properties ◽  
Seasonal Patterns ◽  
Wheat Field ◽  
Soil Biochemical Properties
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