Silviculture systems and associated forest harvesting practices that affect the level of soil compaction and organic matter retained on a site will cause changes to soil properties and processes that may affect the growth of planted trees. We present results for soil conditions and tree growth after 15 years for 6 Long-term Soil Productivity Study (LTSP) installations in 2 distinct regions of the Interior Douglas-fir (IDF) biogeoclimatic zone in southern British Columbia (BC). In a 3 × 3 factorial design, three levels of compaction and organic matter removal were replicated in two distinct IDF regions that varied in parent material, but with similar climates. Each treatment was then split and planted with two different species, Douglas-fir and lodgepole pine. In each region, three unique sites (block), all within a radius of 50 km from one other, were installed with the same combination of treatment and species for a total of six replicates, three in each of two regions. Across IDF regions, tree heights on calcareous soils in the Rocky Mountains of south-eastern BC were 36% lower for Douglas-fir and 23% lower for lodgepole pine than on more acidic soils on the Thompson Plateau. There were varying differences across treatments in soil and foliar nutrient concentrations between IDF regions, primarily from regional parent material differences. However, nutrient deficiencies were apparent in both regions and may have limited growth, especially on the more calcareous sites. Increases to soil bulk density (27%) 1 year after compaction did not impact tree survival, height at Year-15, or chemical properties in foliar tissue or soil. Fewer growing season frost events and increased soil water availability during the seedling establishment period was a likely reason for a 25% increase in Douglas-fir survival at Year-15 with the whole tree + forest floor removal (OM3) treatment. However, whole tree + forest floor removal (OM3) also produced a 13–19% reduction in soil N, S, K, and mineralizable N when compared to both stem-only (OM1) and whole tree (OM2) harvesting treatments that kept the forest floor intact. Effects on forest productivity from soil compaction after 15 years appear to be overshadowed by the more prominent effect of organic matter removal treatments during stand establishment and early growth. Future work at these installations focusing on nutrient budget, forest health, and ecosystem carbon stock differences across treatments will provide valuable insight into silviculture and harvesting practices for different species and regions in the dry forests of southern BC.

会影响土壤压实度和保留在现场的有机物的造林系统和相关的森林采伐方式将导致土壤性质和过程的变化，从而可能影响种植树木的生长。我们为不列颠哥伦比亚省南部（BC）的内道格拉斯冷杉（IDF）生物地理气候区的2个不同区域中的6个长期土壤生产力研究（LTSP）装置提供了15年后土壤状况和树木生长的结果。在3×3因子设计中，在两个不同的IDF区域中复制了三个级别的压实和去除有机物，这些IDF区域的母体材料不同，但气候相似。然后将每种处理分开并种植两种不同的树种：花旗松和黑松。在每个区域中，三个独特的地点（街区）都位于彼此之间50公里的半径内，安装了相同的处理和物种组合，共进行了六次重复，两个区域各重复三个。在整个IDF地区，与汤普森高原酸性较强的土壤相比，BC省东南部落基山脉的石灰质土壤上的树高，道格拉斯冷杉降低36％，黑毛松降低23％。在IDF地区之间，土壤和叶面养分浓度的不同处理方式存在差异，这主要是由于地区母物质差异引起的。但是，营养不足在两个地区都很明显，并且增长有限，尤其是在钙质较高的地区。压实后1年土壤容重的增加（27％）不会影响树木的存活率，第15年的树高或叶面组织或土壤的化学性质。整棵树+林地清除（OM3）处理后，在15年级时，道格拉斯冷杉存活率提高了25％，这可能是在苗期建立期间生长季节霜害事件减少和土壤水分利用率增加的可能。但是，与仅进行茎秆采摘（OM1）和整树采伐（OM2）相比，整棵树+清除森林地面（OM3）还可减少13-19％的土壤氮，硫，钾和可矿化氮。林地完好无损。15年后土壤压实对森林生产力的影响似乎被林分建立和早期生长过程中有机物去除处理的更显着效果所掩盖。这些装置的未来工作将集中在养分预算，森林健康，