scholarly journals Comparison of multiple models for estimating gross primary production using remote sensing data and fluxnet observations

2015 ◽  
Vol 368 ◽  
pp. 75-80
Author(s):  
S. Wang ◽  
X. Mo
Keyword(s):  
Primary Production ◽  
Crop Production ◽  
North China Plain ◽  
North China ◽  
Gross Primary Production ◽  
Remote Sensing Data ◽  
Growing Season ◽  
The North ◽  
The North China Plain ◽  
Eddy Covariance Measurements

Abstract. In this study, gross primary production (GPP) estimated from a temperature and greenness (TG) model, a greenness and radiation (GR) model, a vegetation photosynthesis model (VPM), and a MODIS product have been compared with eddy covariance measurements in cropland during 2003–2005. Results showed that the determination coefficients (R2) between fluxnet GPP and estimated GPP were all greater than 0.74, indicating that all these models offered reliable estimates of GPP. We also found that the VPM-based GPP estimates performed a bit better (R2 is 0.82, and RMSE is 16.75 gC m−2 (8 day)−1) than other models, mainly due to its comprehensive consideration of the stresses from light, temperature and water. The actual GPP was overestimated in the non-growing season and underestimated in the growing season by MOD_GPP. The validation confirms that the above three models may be used to estimate crop production in the North China Plain, but there are still significant uncertainties.

Farmers' Perception of Sustainability for Crop Production on the North China Plain

2007 ◽  
Vol 30 (3) ◽  
pp. 129-147 ◽  
Author(s):  
Y. P. Wei ◽  
R. E. White ◽  
D. Chen ◽  
B. A. Davidson ◽  
J. B. Zhang
Keyword(s):  
Crop Production ◽  
North China Plain ◽  
North China ◽  
The North ◽  
The North China Plain

Effects of optimized N fertilization on greenhouse gas emission and crop production in the North China Plain

2017 ◽  
Vol 205 ◽  
pp. 135-146 ◽  
Author(s):  
Yuechen Tan ◽  
Cong Xu ◽  
Dongxue Liu ◽  
Wenliang Wu ◽  
Rattan Lal ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Crop Production ◽  
North China Plain ◽  
North China ◽  
Greenhouse Gas Emission ◽  
N Fertilization ◽  
Gas Emission ◽  
The North ◽  
The North China Plain

scholarly journals Climate Warming Changed the Planting Boundaries of Varieties of Summer Corn with Different Maturity Levels in the North China Plain

2019 ◽  
Vol 58 (12) ◽  
pp. 2605-2615
Author(s):  
Qi Hu ◽  
Xueqing Ma ◽  
Xuebiao Pan ◽  
Huang Binxiang
Keyword(s):  
Climate Warming ◽  
North China Plain ◽  
North China ◽  
Cropping System ◽  
Growing Season ◽  
Corn Production ◽  
The Past ◽  
The North ◽  
Double Cropping ◽  
The North China Plain

AbstractClimate warming in the North China Plain (NCP) is expected to greatly affect corn production. On the basis of a comprehensive consideration of the double-cropping system, we investigated the impacts of climate warming in the past 55 years on the planting boundaries and areas of varieties of summer corn with different maturity levels. In addition, we tried to explore the probable reasons for the changes in planting boundaries. Climate warming caused a northward shift in the planting boundaries of summer corn, resulting in the expansion of the total planting area. However, the trend for the planting area of each belt of corn maturity was not always consistent. Because of the advanced planting date and delayed physiological maturation date, the growing season of corn in the NCP has been prolonged in the past 55 years. Climate warming also increased the active accumulated temperature with a threshold of 10° (AAT10) during the corn growing season by 73.2°C decade−1, which was mainly caused by the increase in the number of days with a daily temperature over 10°C. In summary, the planting boundaries of varieties of summer corn with different maturity levels have greatly changed due to climate change, and corn production in the NCP could benefit from climate warming through the greater planting area and longer growing season.

scholarly journals Effects of Strategic Tillage on Soil Physicochemical Properties and Grain Yield in the North China Plain

Agronomy ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1167
Author(s):  
Qiuyue Liu ◽  
Zhengrong Kan ◽  
Cong He ◽  
Hailin Zhang
Keyword(s):  
Physicochemical Properties ◽  
Soil Compaction ◽  
Crop Production ◽  
North China Plain ◽  
North China ◽  
Soil Depth ◽  
Soil Physicochemical Properties ◽  
The North ◽  
The North China Plain ◽  
No Till

No-till (NT) practice has been widely adopted to improve soil quality, but soil compaction and soil organic carbon (SOC) stratification under long-term NT limit crop production. Strategic tillage (ST), based on single tillage, is proposed as an attractive management practice to sustain the benefits of continuous NT and mitigate its adverse effects. Four tillage systems, including continuous rotary tillage (RT), NT, rotary tillage + subsoiling (RS), and no-till + subsoiling (NS), were implemented to investigate the effects of strategic tillage (i.e., RS and NS) on soil physical properties (compaction and aggregates), SOC, and crop yield in the North China Plain (NCP). The results showed that ST as expected decreased soil bulk density, penetration resistance, and SOC stratification compared with RT and NT at 0–20 cm soil depth (p < 0.05). At 0–10 cm soil depth, more macroaggregates (>0.25 mm) were observed in NT and NS, contributing to higher mean weight and geometric mean diameters, this compared with RT and RS. Additionally, macroaggregate associated SOC was higher, thus resulting in higher SOC storage in NT (31.4–33.4 Mg ha −1) and NS (33.3–35.4 Mg ha−1) at 0–30 cm depth (p < 0.05). Low soil compaction and high SOC in NS were beneficial for the grain yield of wheat and maize, significantly higher by 8.7–32.5% and 14.0–29.8% compared with the other treatments, respectively (p < 0.05). Based on our findings, NS seems to be a promising alternative tillage system to improve soil physicochemical properties and crop production in the NCP. More studies are therefore needed to better understand the benefit of NS.

Relationships between drought disasters and crop production during ENSO episodes across the North China Plain

2014 ◽  
Vol 15 (8) ◽  
pp. 1689-1701 ◽  
Author(s):  
Yuan Liu ◽  
Buchun Liu ◽  
Xiaojuan Yang ◽  
Wei Bai ◽  
Jian Wang
Keyword(s):  
Crop Production ◽  
North China Plain ◽  
North China ◽  
The North ◽  
The North China Plain
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