北部：松辽平原、内蒙古大草原。
长岭县位于吉林省西部，松辽平原腹地。
Changling County is located at the west of Jilin Province, the hinterland of Songliao Plain.
松辽平原在地貌和地质上都是一个盆地。
The Songliao plain is a basin in both topography and geology.
哈尔滨的松花江流域属于松辽平原的草甸草原草场范畴。
Songhua river basin of Harbin is belong to meadow steppe in Songliao Plain.
苏打盐碱地主要分布在我国东北地区，是松辽平原农业综合开发的重点对象之一。
The Soda Saline Alkali Land is distributed mainly over the Northeast China and is one of the major soil types for the comprehensive agriculture exploitation in Songliao Plain.
通过田间调查和土壤肥力指标分析，探讨了松辽平原玉米带黑土肥力退化的原因和机理。
Through field investigation and soil fertility index analysis, causes and mechanism of fertility degradation of black soil in the Songliao Plain were explored.
以松辽平原为案例，首次提出并论证了“人类强胁迫力作用于脆弱环境系统必将导致生态环境突变”的命题。
Taking Songliao Plain as an example, the proposition that strong stress makes a fragile environment into catastrophe is demonstrated for the first time.
以松辽平原为案例，首次提出并论证了“人类强胁迫力作用于脆弱环境系统必将导致生态环境突变”的命题。
Taking Songliao Plain as an example, the proposition that strong stress makes a fragile environment into catastrophe is demonstrated for the first time.
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