Soil physicochemical properties in a high-quality tea production area of Thai Nguyen province in northern region, Vietnam
Soil physicochemical properties in a high-quality tea production area of Thai Nguyen province in northern region, Vietnam
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DOI：
10.1080/00380768.2018.1539310
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发表时间：
2018-11
影响因子：
2
通讯作者：
Hoang Huu Chien;Maho Tokuda;Dang Van Minh;Yumei Kang;K. Iwasaki;Sota Tanaka
中科院分区：
文献类型：
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作者：
Hoang Huu Chien;Maho Tokuda;Dang Van Minh;Yumei Kang;K. Iwasaki;Sota Tanaka
摘要本研究调查了越南Tan Cuong公社丛河冲积平原茶园土壤的一般理化性质。四个花园被选为研究地点的三个样条线建立垂直于河流。从地表（0-10厘米）和地下（20-30厘米）采集土壤样品。土壤质地类型从桑迪到轻粘土不等，这与样带沿线沿着不同的地形以及梯田和挖土等严重干扰有关。全C和全N含量与园龄的增加相关，表明植物残体和有机肥的添加对土壤有机质库有一定的补充作用。同时，土壤呈强酸性，平均pH值（H2O）为3.7在表面和3.9在地下。有效阳离子交换容量（ECEC）较低，分别为4.7和4.9 cmolc kg−1，主要由可交换的Al 3+组成。随着园龄的增加，土壤酸化加剧。然而，一个相对较大的饱和度的交换性钙（Ca 2+），钾（K+），镁（Mg 2+）的ECEC被发现在表层土壤。有效磷的含量很高，偶尔在地表和次表层分别超过1000和500 mg kg−1。尽管在强酸性条件下，铵态氮（NH 4-N）作为肥料被转化为硝酸盐（NO 3-N），并向下移动到更深的层。碱、磷和矿质氮的水平似乎主要取决于管理措施。这些营养物质中有很大一部分可能以水溶性形式存在，而不会吸附到土壤中。应要求制定适当的计划，并教育所有者进行适当的肥料管理。
ABSTRACT This study investigated general physicochemical properties of tea garden soils at the alluvial plain of Cong River in Tan Cuong commune, Vietnam. Four gardens were selected as study sites on three transect lines established perpendicularly to the river. Soil samples were collected from the surface (0–10 cm) and subsurface (20–30 cm). Soil texture classes varied from sandy loam to light clay, which was affected by different terrains along the transect lines as well as severe disturbance such as terracing and earth excavation. The levels of total C and total N were correlated with increasing garden age, suggesting the replenishment of soil organic matter pool by the addition of plant residue and manure. Meanwhile, the soils showed strongly acidic nature with the average pH(H2O) of 3.7 at the surface and 3.9 at the subsurface. The effective cation exchange capacity (ECEC) was low at 4.7 and 4.9 cmolc kg−1, respectively, and dominated by exchangeable Al3+. Soil acidification was exacerbated with increasing garden age. However, a relatively large saturation of exchangeable calcium (Ca2+), potassium (K+), and magnesium (Mg2+) on the ECEC was found in the surface soils. The levels of available P were high, occasionally exceeding 1000 and 500 mg kg−1 at the surface and subsurface, respectively. In spite of strongly acidic condition, ammonium (NH4-N) applied as fertilizer was converted to nitrate (NO3-N) to move down to deeper layers. The levels of the bases, P, and mineral N seem to be principally determined by management practices. Significant portion of these nutrients was likely to exist in water soluble forms without adsorption onto soils. It should be required to develop proper schemes and to educate the owners for adequate fertilizer managements.