Tree species, diameter, and canopy class records for 4-paired plots in Black Rock Forest, NY, since 1931.

Black Rock Forest maintains eight long-term forest monitoring plots in Cornwall, NY. Four pairs of plots were established in 1931 to compare thinning treatments to nearby control plots. Four plots are approximately 0.25 acres and the other four are 0.1 acres. Tree species, diameter at breast height, height and canopy class have been measured on all stems greater than 1 inch in diameter since 1931. Plots were revisited every five years until the 1990s and annually from 1994 to 2023.黑石森林（Black Rock Forest）在纽约州康沃尔市设置了8个长期森林监测样地。1931年，研究人员设立4组成对样地，以对比疏伐处理样地与邻近对照样地的差异。该批样地中，4块面积约为0.25英亩，剩余4块面积为0.1英亩。自1931年起，所有直径大于1英寸的木本植株的树种、胸径、树高及冠层等级均被纳入测定范围。1990年代以前，样地每5年复测一次；1994年至2023年期间，复测频率调整为每年1次。