Acacia sieberiana Effects on Soil Properties and Plant Diversity in Songa Pastures, Rwanda
Table 3
Light intensity measured at six locations (0, 7.5, 15, 20, 25 and 30 m) from Acacia sieberiana tree base in Songa pasture southern Rwanda. Upper table shows measurements expressed as % of light relative to open pasture; lower table measurements are expressed as photosynthetic photon flux density (M m−2 s−1).
Time
Sensor identity (distance from tree base, m)
1 (0)
2 (7.5)
3 (15)
4 (20)
5 (25)
6 (30)
6:00
38.4
62.6
84.8
99.4
97.3
100.0
8:00
39.3
60.0
83.6
98.7
99.2
100.0
10:00
35.7
61.5
84.1
95.4
96.0
100.0
12:00
37.2
68.2
85.3
99.4
99.9
100.0
14:00
37.2
60.1
88.3
98.4
99.9
100.0
16:00
37.7
60.1
81.0
98.5
100.2
100.0
18:00
38.0
45.5
85.9
93.5
99.7
100.0
Average
37.6
59.7
84.7
97.6
98.9
100.0
60.7*
98.8**
6:00
215.4
351.2
475.5
557.4
545.6
560.7
8:00
265.3
405.5
564.7
666.9
670.3
675.5
10:00
373.5
642.4
878.8
997.6
1003.1
1045.2
12:00
470.6
862.4
1078.8
1257.2
1262.4
1264.2
14:00
463.5
748.9
1101.4
1227.4
1245.7
1246.9
16:00
299.3
477.7
643.6
782.4
795.6
794.4
18:00
211.6
253.5
478.5
521.2
555.5
557.3
Average
328.5
534.5
745.9
858.6
868.3
877.7
536.3*
868.2**
Overall average light: *under tree canopy and **in open pasture.
