Agriculture Reference
In-Depth Information
this is usually
Macrozamia reidlei
, which regenerates from swollen roots below soil after
fire (Grove et al., 1980), and in the Northern Territory from an arboreal species of
Cycas
,
C. armstrongii
, that produces new growth on aerial stems after fire in a way reminiscent
of re-sprouting by eucalypts, which are the major tree component, except that the cycad
re-sprouts first (L. Hutley, personal communication).
2.3 Seasonally dry tropical forests (succulent biome)
2.3.1 Caatinga
This type of vegetation is typical of the semi-arid northeast of Brazil, where it covers
850 thousand km
2
(Plate 2.8). It is the largest of a number of similar areas in the neotrop-
ics (Queiros, 2006). As in the Cerrados, legumes are the most common plants in this
vegetation and have been well enumerated (Queiros, 2006). Table 2.2A summarises the
genera and species in each sub-family. The genus
Blanchetiodendron
(Mimosoideae) has
one species and no report of nodulation, but because of its affinities it is tentatively
included with the nodulating group. It is a measure of the amount of work done in
this region and in the Cerrados, that this is the only genus whose nodulation status is
unknown. Within Caesalpinioideae, the largest number of species (27) are in
Chamae-
crista
, with non-nodulating
Senna
(19) and
Bauhinia
(16) also >10. In Mimosoideae, the
largest number of species are in
Mimosa
(37), followed by
Calliandra
(12) and
Acacia
(11).
In Papilionoideae, there are no genera with more than 9 species present, but in terms
Tab l e 2 . 2 A .
Summary of legumes found in the Caatinga region of
Northeast Brazil. Data from Queiros (2006).
B.
SDTF of Peru, from
Linares-Palomina, 2006 and the RBGE database. Note in the latter that there
is one genus of unknown nodulation status and that one of the species of
Acacia
cannot nodulate (see Chapter 1)
Genera
Species
Nod
Non-nod
Nod
Non-nod
A
Caesalpinioideae
2
17
27
64
Mimosoideae
18
1
90
2
Papilionoideae
35
4
103
7
B
Caesalpinioideae
1
6
1
20
Mimosoideae
16
1
44
1
Papilionoideae
16
2
+
1?
32
2
+
1?
