Effects of collapsing gully erosion on soil qualities of farm fields in the hilly granitic region of

来源 :Journal of Integrative Agriculture | 被引量 : 0次 | 上传用户:www_52810_com
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Collapsing gully erosion is a specific form of soil erosion types in the hilly granitic region of tropical and subtropical South China, and can result in extremely rapid water and soil loss. Knowledge of the soil physical and chemical properties of farmland influenced by collapsing gully erosion is important in understanding the development of soil quality. This study was conducted at the Wuli Watershed of the Tongcheng County, south of Hubei Province, China. The aim is to investigate soil physical and chemical properties of three soil layers(0–20, 20–40 and 40–60 cm) for two farmland types(paddy field and upland field) in three regions influenced by collapsing gully erosion. The three regions are described as follows: strongly influenced region(SIR), weakly influenced region(WIR) and non-influenced region(NIR). The results show that collapsing gully erosion significantly increased the soil gravel and sand content in paddy and upland fields, especially the surface soil in the SIR and WIR. In the 0–20 cm layer of the paddy field, the highest gravel content(250.94 g kg~(–1)) was in the SIR and the lowest(78.67 g kg~(–1)) was in the NIR, but in the upland filed, the surface soil(0–20 cm) of the SIR and the 40–60 cm soil layer for the NIR had the highest(177.13 g kg~(–1)) and the lowest(59.96 g kg~(–1)) values of gravel content, respectively. The distribution of gravel and sand decreased with depth in the three influenced regions, but silt and clay showed the inverse change. In the paddy field, the average of sand content decreased from 58.6(in the SIR) to 49.0%(in the NIR), but the silt content was in a reverse order, increasing from 27.9 to 36.9%, and the average of the clay content of three regions showed no significant variation(P<0.05). But in the upland filed, the sand, silt and clay fluctuated in the NIR and the WIR. Soils in the paddy and upland field were highly acidic(p H<5.2) in the SIR and WIR; moreover lower nutrient contents(soil organic matter(SOM), total N and available N, P, K) existed in the SIR. In the 0–20 cm soil layer of the paddy field, compared with the NIR and the WIR, collapsing gully erosion caused a very sharp decrease in the SOM and total N of the SIR(5.23 and 0.56 g kg~(–1), respectively). But in the surface soil(0–20 cm) of the upland field, the highest SOM, total N, available N, available P and available K occurred in the NIR, and the lowest ones were in the SIR. Compared with the NIR, the cationexchange capacity(CEC) in the SIR and WIR was found to be relatively lower. These results suggest that collapsing gully erosion seriously affect the soil physical and chemical properties of farmland, lead to coarse particles accumulation in the field and decrease p H and nutrient levels. Collapsing gully erosion is a specific form of soil erosion types in the hilly granitic region of tropical and subtropical South China, and can result in extremely rapid water and soil loss. Knowledge of the soil physical and chemical properties of farmland influenced by collapsing gully erosion is important in understanding the development of soil quality. This study was conducted at the Wuli Watershed of the Tongcheng County, south of Hubei Province, China. The aim is to investigate soil physical and chemical properties of three soil layers (0-20, 20- 40 and 40-60 cm) for two farmland types (paddy field and upland field) in three regions by collapsing gully erosion. The three regions are described as follows: strongly conditioned region (SIR), weakly affected region (WIR) and non -fluenced region (NIR). The results show that collapsing gully erosion significantly increased the soil gravel and sand content in paddy and upland fields, especially the surface soil in the SIR and WIR. In the 0-20 cm layer of the paddy field, the highest gravel content (250.94 g kg -1) was in the SIR and the lowest (78.67 g kg -1) was in the NIR , but in the upland filed, the surface soil (0-20 cm) of the SIR and the 40-60 cm soil layer for the NIR had the highest (177.13 g kg -1) and the lowest (59.96 g kg ~ (-1)) values ​​of gravel content, respectively. The distribution of gravel and sand decreased with depth in the three sensitive regions, but silt and clay showed the inverse change. In the paddy field, the average of sand content decreased from 58.6 (in the SIR) to 49.0% (in the NIR), but the silt content was in a reverse order, increasing from 27.9 to 36.9%, and the average of the clay content of three regions showed no significant variation (P <0.05) . But in the upland filed, the sand, silt and clay fluctuated in the NIR and the WIR. Soils in the paddy and upland field were highly acidic (p H <5.2) in the SIR and WIR; moreover lower nutrient contents (soil organi c matter (SOM), totalN and available N, P, K) existed in the SIR. In the 0-20 cm soil layer of the paddy field, compared with the NIR and the WIR, collapsing gully erosion caused a very sharp decrease in the SOM and total N of the SIR (5.23 and 0.56 g kg -1) respectively. But in the surface soil (0-20 cm) of the upland field, the highest SOM, total N, available N, available P and available K occurred in the NIR, and the highest ones were in the SIR. Compared with the NIR, the cation exchange capacity (CEC) in the SIR and WIR was found to be relatively lower. These results suggest that collapsing gully erosion seriously affect the soil physical and chemical properties of farmland, lead to coarse particles accumulation in the field and decrease p H and nutrient levels.
其他文献
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
目的观察高压氧对缺血性视神经病变大鼠氧化应激和凋亡的影响。方法采用数字表法将30只SD大鼠随机分为3组(每组10只):假手术组、模型组和高压氧组。假手术组只给与手术,不造成缺血性视神经病变;模型组和高压氧组给予缺血性视神经病变处理,高压氧组术后给予高压氧处理。采用实时荧光定量PCR检测各组视神经Nrf2 mRNA和NF-κB mRNA相对表达含量,采用Western-blot方法检测各组视神经Nr
Following a rice or wheat harvest, a large amount of crop residue(straw) is retained in fields. The straw is often incorporated into the soil in order to increa
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
期刊
Agricultural soils are deficient of phosphorus(P) worldwide. Phosphatic fertilizers are therefore applied to agricultural soils to improve the fertility and to
期刊