Publication Information

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195, 207, 222], 'in': [2, 11, 110, 116], 'Helan': [3], 'Mountain': [4], 'is': [5, 42], 'the': [6, 14, 79, 87, 114, 117, 147, 157, 169, 176, 206], 'relatively': [7], 'rare': [8], 'ecosystem': [10], 'northwestern': [12], 'China.For': [13], 'conservation': [15], 'of': [16, 22, 32, 37, 47, 54, 62, 69, 83, 95, 156, 159, 164, 171, 178], 'forest,the': [17, 123, 150], 'structure': [18, 161, 191, 196], 'and': [19, 59, 67, 127, 132, 142, 175, 192, 197], 'floristic': [20, 139, 193], 'composition': [21, 140, 166, 199], 'coniferous': [23, 119], 'have': [25], 'been': [26], 'studied.Based': [27], 'on': [28, 92], 'principal': [29], 'components': [30], 'analysis': [31, 94], 'structure,mainly': [34], 'four': [35], 'kinds': [36], 'could': [39, 100, 213], 'be': [40, 101, 214], 'obtained,that': [41], 'diameter': [43], 'at': [44], 'breast': [45], 'height(DBH)': [46], 'trees': [48, 55, 63, 70], 'mostly': [49, 56, 71], 'less': [50], 'than': [51, 73], '10': [52, 58], 'cm,DBH': [53, 61], 'between': [57, 189], 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