The Changes Of The Reclamation Rate Of Cultivated Land In The Yellow

The Changes Of The Reclamation Rate Of Cultivated Land In The Yellow The changes of the reclamation rate of cultivated land in the yellow river–huangshui river valley in two historical periods of from 1650 to1772 and 1772–1934. This study created an approach based on the relationship between cultivation intensity and forest fraction to reconstruct forest cover changes in central and southeast europe from ad 1800 to.

The Spatial Distribution Of The Reclamation Rate Of Cultivated Land In In this study, cropland changes at the yellow river huangshui river valley, as a typical agro pastoral transition zone in northwestern china, is analyzed in terms of the changes of total. In this study, a complex and spe cificareaattheyellowriver–huangshuiriverval ley (yhv) is chosen to analyze the interactions among climate change(zhang et al 2019), crop land changes and human activities over the last 300years. In historical regional cropland reconstruction in floodplains and delta areas, changes in the river system and the historical distribution of settlements are important to the spatial–temporal dynamic process of historical land reclamation. this paper takes the yellow river delta as the research area, combines historical data with field investigation, and analyzes the influence of river. At that time, the cultivated land in the yrb accounted for 30.2% of the national cultivated land, with an average reclamation rate of 21%. in the plain areas of the mid to lower reaches, such as the huang huai hai and guanzhong regions, the reclamation rates mostly exceeded 40.

Pdf Effects Of Land Reclamation On Cultivated Land Benefit And Grain In historical regional cropland reconstruction in floodplains and delta areas, changes in the river system and the historical distribution of settlements are important to the spatial–temporal dynamic process of historical land reclamation. this paper takes the yellow river delta as the research area, combines historical data with field investigation, and analyzes the influence of river. At that time, the cultivated land in the yrb accounted for 30.2% of the national cultivated land, with an average reclamation rate of 21%. in the plain areas of the mid to lower reaches, such as the huang huai hai and guanzhong regions, the reclamation rates mostly exceeded 40. Interregional contribution rate of pf was as high as 74.64%. therefore, the k means clustering zoning scheme had a small gap in the functional zones of cultivated land, and the interregional gap is the main reason for the overall regional differences in the functions of cultivated land. We hypothesize that in the reclamation area of the yrd: (1) the carbon stocks and allocation are significantly affected by land use types and soil depth; and (2) the yrd area was likely an important carbon sink prior to the large scale reclamation in the 1950s. Based on the national cultivated land protection policy the background of “the ecological protection of the yellow river basin”, we proposed suggestions for cultivated land use, protection and restoration in cities along the main stream of the yellow river in henan. The research results showed that: 1） in the past 20 years, the annual average cultivated land reclamation in china had been 263.22×104 hm2, with an average annual reclamation rate of 1.39%, and was relatively concentrated in the northwestern, northeastern and southwestern regions.